2556123635451 has 16 divisors (see below), whose sum is σ = 3556732241664. Its totient is φ = 1629814822944.

The previous prime is 2556123635449. The next prime is 2556123635459. The reversal of 2556123635451 is 1545363216552.

It is not a de Polignac number, because 2556123635451 - 2¹ = 2556123635449 is a prime.

It is a super-2 number, since 2×2556123635451² (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 2556123635451.

It is not an unprimeable number, because it can be changed into a prime (2556123635459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1370776 + ... + 2644101.

It is an arithmetic number, because the mean of its divisors is an integer number (222295765104).

Almost surely, 2^{2556123635451} is an apocalyptic number.

2556123635451 is a deficient number, since it is larger than the sum of its proper divisors (1000608606213).

2556123635451 is a wasteful number, since it uses less digits than its factorization.

2556123635451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024130.

The product of its digits is 3240000, while the sum is 48.

The spelling of 2556123635451 in words is "two trillion, five hundred fifty-six billion, one hundred twenty-three million, six hundred thirty-five thousand, four hundred fifty-one".