1656820864 has 32 divisors (see below), whose sum is σ = 3342499200. Its totient is φ = 817919232.

The previous prime is 1656820859. The next prime is 1656820889. The reversal of 1656820864 is 4680286561.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71812 + ... + 92035.

It is an arithmetic number, because the mean of its divisors is an integer number (104453100).

Almost surely, 2^1656820864 is an apocalyptic number.

It is an amenable number.

1656820864 is an abundant number, since it is smaller than the sum of its proper divisors (1685678336).

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

1656820864 is an equidigital number, since it uses as much as digits as its factorization.

1656820864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163940 (or 163928 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The square root of 1656820864 is about 40704.0644653578. The cubic root of 1656820864 is about 1183.2917909814.

The spelling of 1656820864 in words is "one billion, six hundred fifty-six million, eight hundred twenty thousand, eight hundred sixty-four".