56687396977 has 4 divisors (see below), whose sum is σ = 56802850416. Its totient is φ = 56571943540.

The previous prime is 56687396957. The next prime is 56687396981. The reversal of 56687396977 is 77969378665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56687396977 - 2²³ = 56679008369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56687396947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57725983 + ... + 57726964.

It is an arithmetic number, because the mean of its divisors is an integer number (14200712604).

Almost surely, 2^56687396977 is an apocalyptic number.

It is an amenable number.

56687396977 is a deficient number, since it is larger than the sum of its proper divisors (115453439).

56687396977 is a wasteful number, since it uses less digits than its factorization.

56687396977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115453438.

The product of its digits is 720135360, while the sum is 73.

The spelling of 56687396977 in words is "fifty-six billion, six hundred eighty-seven million, three hundred ninety-six thousand, nine hundred seventy-seven".