56659786899515 has 16 divisors (see below), whose sum is σ = 68098405729728. Its totient is φ = 45256771961856.

The previous prime is 56659786899511. The next prime is 56659786899589. The reversal of 56659786899515 is 51599868795665.

It is a cyclic number.

It is not a de Polignac number, because 56659786899515 - 2² = 56659786899511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56659786899511) by changing a digit.

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, 5927639 + ... + 12184271.

It is an arithmetic number, because the mean of its divisors is an integer number (4256150358108).

Almost surely, 2^{56659786899515} is an apocalyptic number.

56659786899515 is a deficient number, since it is larger than the sum of its proper divisors (11438618830213).

56659786899515 is a wasteful number, since it uses less digits than its factorization.

56659786899515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6259478.

The product of its digits is 44089920000, while the sum is 89.

The spelling of 56659786899515 in words is "fifty-six trillion, six hundred fifty-nine billion, seven hundred eighty-six million, eight hundred ninety-nine thousand, five hundred fifteen".