56668680637 has 4 divisors (see below), whose sum is σ = 57170173500. Its totient is φ = 56167187776.

The previous prime is 56668680589. The next prime is 56668680643. The reversal of 56668680637 is 73608686665.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5968953081 + 50699727556 = 77259^2 + 225166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56668680637 is a prime.

It is a super-2 number, since 2×56668680637² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56668680697) 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, 250746262 + ... + 250746487.

It is an arithmetic number, because the mean of its divisors is an integer number (14292543375).

Almost surely, 2^56668680637 is an apocalyptic number.

It is an amenable number.

56668680637 is a deficient number, since it is larger than the sum of its proper divisors (501492863).

56668680637 is a wasteful number, since it uses less digits than its factorization.

56668680637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501492862.

The product of its (nonzero) digits is 52254720, while the sum is 61.

The spelling of 56668680637 in words is "fifty-six billion, six hundred sixty-eight million, six hundred eighty thousand, six hundred thirty-seven".