56612721677 has 4 divisors (see below), whose sum is σ = 56613234240. Its totient is φ = 56612209116.

The previous prime is 56612721673. The next prime is 56612721679. The reversal of 56612721677 is 77612721665.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 77612721665 = 5 ⋅15522544333.

It is a cyclic number.

It is not a de Polignac number, because 56612721677 - 2² = 56612721673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56612721673) 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, 14693 + ... + 336810.

It is an arithmetic number, because the mean of its divisors is an integer number (14153308560).

Almost surely, 2^56612721677 is an apocalyptic number.

It is an amenable number.

56612721677 is a deficient number, since it is larger than the sum of its proper divisors (512563).

56612721677 is a wasteful number, since it uses less digits than its factorization.

56612721677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512562.

The product of its digits is 1481760, while the sum is 50.

The spelling of 56612721677 in words is "fifty-six billion, six hundred twelve million, seven hundred twenty-one thousand, six hundred seventy-seven".