1131604656660 has 120 divisors (see below), whose sum is σ = 3556040971560. Its totient is φ = 301238009856.

The previous prime is 1131604656619. The next prime is 1131604656673. The reversal of 1131604656660 is 666564061311.

It can be written as a sum of positive squares in 4 ways, for example, as 127624704516 + 1003979952144 = 357246^2 + 1001988^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 329436 + ... + 1540044.

It is an arithmetic number, because the mean of its divisors is an integer number (29633674763).

Almost surely, 2^{1131604656660} is an apocalyptic number.

1131604656660 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 1131604656660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1778020485780).

1131604656660 is an abundant number, since it is smaller than the sum of its proper divisors (2424436314900).

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

1131604656660 is a wasteful number, since it uses less digits than its factorization.

1131604656660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211207 (or 1211196 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 1131604656660 in words is "one trillion, one hundred thirty-one billion, six hundred four million, six hundred fifty-six thousand, six hundred sixty".