1657897656 has 32 divisors (see below), whose sum is σ = 4165584000. Its totient is φ = 549853920.

The previous prime is 1657897609. The next prime is 1657897663. The reversal of 1657897656 is 6567987561.

It is a self number, because there is not a number n which added to its sum of digits gives 1657897656.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 168790 + ... + 178341.

It is an arithmetic number, because the mean of its divisors is an integer number (130174500).

Almost surely, 2^1657897656 is an apocalyptic number.

It is an amenable number.

1657897656 is an abundant number, since it is smaller than the sum of its proper divisors (2507686344).

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

1657897656 is a wasteful number, since it uses less digits than its factorization.

1657897656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347339 (or 347335 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 60.

The square root of 1657897656 is about 40717.2893989765. The cubic root of 1657897656 is about 1183.5480816543.

The spelling of 1657897656 in words is "one billion, six hundred fifty-seven million, eight hundred ninety-seven thousand, six hundred fifty-six".