1011621660 has 144 divisors (see below), whose sum is σ = 3311917056. Its totient is φ = 230041728.

The previous prime is 1011621649. The next prime is 1011621671. The reversal of 1011621660 is 661261101.

1011621660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1011621649) and next prime (1011621671).

It is a self number, because there is not a number n which added to its sum of digits gives 1011621660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 654849 + ... + 656391.

It is an arithmetic number, because the mean of its divisors is an integer number (22999424).

Almost surely, 2^1011621660 is an apocalyptic number.

1011621660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011621660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1655958528).

1011621660 is an abundant number, since it is smaller than the sum of its proper divisors (2300295396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011621660 is a wasteful number, since it uses less digits than its factorization.

1011621660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792 (or 1783 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1011621660 is about 31806.0003772873. Note that the first 3 decimals coincide. The cubic root of 1011621660 is about 1003.8589758167.

Subtracting from 1011621660 its sum of digits (24), we obtain a square (1011621636 = 31806²).

Adding to 1011621660 its reverse (661261101), we get a palindrome (1672882761).

The spelling of 1011621660 in words is "one billion, eleven million, six hundred twenty-one thousand, six hundred sixty".