56999666655567 has 64 divisors (see below), whose sum is σ = 90278688568320. Its totient is φ = 35455545100800.

The previous prime is 56999666655553. The next prime is 56999666655571. The reversal of 56999666655567 is 76555666699965.

It is a happy number.

56999666655567 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56999666655567 - 2⁸ = 56999666655311 is a prime.

It is a super-2 number, since 2×56999666655567² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56999666655577) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 165859528 + ... + 166202834.

It is an arithmetic number, because the mean of its divisors is an integer number (1410604508880).

Almost surely, 2^{56999666655567} is an apocalyptic number.

56999666655567 is a deficient number, since it is larger than the sum of its proper divisors (33279021912753).

56999666655567 is a wasteful number, since it uses less digits than its factorization.

56999666655567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349901 (or 349895 counting only the distinct ones).

The product of its digits is 148803480000, while the sum is 90.

The spelling of 56999666655567 in words is "fifty-six trillion, nine hundred ninety-nine billion, six hundred sixty-six million, six hundred fifty-five thousand, five hundred sixty-seven".