2564558671656 has 32 divisors (see below), whose sum is σ = 6412574921760. Its totient is φ = 854695791552.

The previous prime is 2564558671637. The next prime is 2564558671669. The reversal of 2564558671656 is 6561768554652.

It is a super-2 number, since 2×2564558671656² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9685335 + ... + 9946598.

It is an arithmetic number, because the mean of its divisors is an integer number (200392966305).

Almost surely, 2^{2564558671656} is an apocalyptic number.

It is an amenable number.

2564558671656 is an abundant number, since it is smaller than the sum of its proper divisors (3848016250104).

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

2564558671656 is a wasteful number, since it uses less digits than its factorization.

2564558671656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19637385 (or 19637381 counting only the distinct ones).

The product of its digits is 362880000, while the sum is 66.

The spelling of 2564558671656 in words is "two trillion, five hundred sixty-four billion, five hundred fifty-eight million, six hundred seventy-one thousand, six hundred fifty-six".