2621040401656 has 64 divisors (see below), whose sum is σ = 5367940300800. Its totient is φ = 1195204636800.

The previous prime is 2621040401641. The next prime is 2621040401711. The reversal of 2621040401656 is 6561040401262.

It is a super-2 number, since 2×2621040401656² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556155 + ... + 2356138.

It is an arithmetic number, because the mean of its divisors is an integer number (83874067200).

Almost surely, 2^{2621040401656} is an apocalyptic number.

It is an amenable number.

2621040401656 is an abundant number, since it is smaller than the sum of its proper divisors (2746899899144).

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

2621040401656 is a wasteful number, since it uses less digits than its factorization.

2621040401656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912540 (or 2912536 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 2621040401656 in words is "two trillion, six hundred twenty-one billion, forty million, four hundred one thousand, six hundred fifty-six".