1660554820 has 48 divisors (see below), whose sum is σ = 3586480128. Its totient is φ = 645356160.

The previous prime is 1660554809. The next prime is 1660554853. The reversal of 1660554820 is 284550661.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 1660554820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 785565 + ... + 787675.

It is an arithmetic number, because the mean of its divisors is an integer number (74718336).

Almost surely, 2^1660554820 is an apocalyptic number.

1660554820 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 1660554820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1793240064).

1660554820 is an abundant number, since it is smaller than the sum of its proper divisors (1925925308).

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

1660554820 is a wasteful number, since it uses less digits than its factorization.

1660554820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220 (or 3218 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 1660554820 is about 40749.9057667622. The cubic root of 1660554820 is about 1184.1800472252.

The spelling of 1660554820 in words is "one billion, six hundred sixty million, five hundred fifty-four thousand, eight hundred twenty".