56577761421 has 16 divisors (see below), whose sum is σ = 79882704000. Its totient is φ = 35496119808.

The previous prime is 56577761413. The next prime is 56577761437. The reversal of 56577761421 is 12416777565.

It is a happy number.

It is not a de Polignac number, because 56577761421 - 2³ = 56577761413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56577761021) 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, 495480 + ... + 598878.

It is an arithmetic number, because the mean of its divisors is an integer number (4992669000).

Almost surely, 2^56577761421 is an apocalyptic number.

56577761421 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

56577761421 is a deficient number, since it is larger than the sum of its proper divisors (23304942579).

56577761421 is a wasteful number, since it uses less digits than its factorization.

56577761421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114148.

The product of its digits is 2469600, while the sum is 51.

The spelling of 56577761421 in words is "fifty-six billion, five hundred seventy-seven million, seven hundred sixty-one thousand, four hundred twenty-one".