56687814521 has 8 divisors (see below), whose sum is σ = 61200661704. Its totient is φ = 52196716800.

The previous prime is 56687814517. The next prime is 56687814529. The reversal of 56687814521 is 12541878665.

It can be written as a sum of positive squares in 4 ways, for example, as 5493774400 + 51194040121 = 74120^2 + 226261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56687814521 - 2² = 56687814517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56687814529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5431946 + ... + 5442371.

It is an arithmetic number, because the mean of its divisors is an integer number (7650082713).

Almost surely, 2^56687814521 is an apocalyptic number.

It is an amenable number.

56687814521 is a deficient number, since it is larger than the sum of its proper divisors (4512847183).

56687814521 is a wasteful number, since it uses less digits than its factorization.

56687814521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10874731.

The product of its digits is 3225600, while the sum is 53.

The spelling of 56687814521 in words is "fifty-six billion, six hundred eighty-seven million, eight hundred fourteen thousand, five hundred twenty-one".