1656561992 has 16 divisors (see below), whose sum is σ = 3106512000. Its totient is φ = 828158800.

The previous prime is 1656561943. The next prime is 1656562001. The reversal of 1656561992 is 2991656561.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1656561992.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71009 + ... + 91407.

It is an arithmetic number, because the mean of its divisors is an integer number (194157000).

Almost surely, 2^1656561992 is an apocalyptic number.

It is an amenable number.

1656561992 is a deficient number, since it is larger than the sum of its proper divisors (1449950008).

1656561992 is a wasteful number, since it uses less digits than its factorization.

1656561992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30556 (or 30552 counting only the distinct ones).

The product of its digits is 874800, while the sum is 50.

The square root of 1656561992 is about 40700.8844129953. The cubic root of 1656561992 is about 1183.2301594809.

The spelling of 1656561992 in words is "one billion, six hundred fifty-six million, five hundred sixty-one thousand, nine hundred ninety-two".