2604607981656 has 32 divisors (see below), whose sum is σ = 6511580525760. Its totient is φ = 868194584352.

The previous prime is 2604607981607. The next prime is 2604607981681. The reversal of 2604607981656 is 6561897064062.

It is a super-2 number, since 2×2604607981656² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2604607981656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2492151 + ... + 3379353.

It is an arithmetic number, because the mean of its divisors is an integer number (203486891430).

Almost surely, 2^{2604607981656} is an apocalyptic number.

It is an amenable number.

2604607981656 is an abundant number, since it is smaller than the sum of its proper divisors (3906972544104).

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

2604607981656 is a wasteful number, since it uses less digits than its factorization.

2604607981656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009535 (or 1009531 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 2604607981656 in words is "two trillion, six hundred four billion, six hundred seven million, nine hundred eighty-one thousand, six hundred fifty-six".