56564257987 has 4 divisors (see below), whose sum is σ = 56565329256. Its totient is φ = 56563186720.

The previous prime is 56564257969. The next prime is 56564257991. The reversal of 56564257987 is 78975246565.

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

It is a cyclic number.

It is not a de Polignac number, because 56564257987 - 2²⁷ = 56430040259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56564257907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452089 + ... + 563482.

It is an arithmetic number, because the mean of its divisors is an integer number (14141332314).

Almost surely, 2^56564257987 is an apocalyptic number.

56564257987 is a deficient number, since it is larger than the sum of its proper divisors (1071269).

56564257987 is a wasteful number, since it uses less digits than its factorization.

56564257987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071268.

The product of its digits is 127008000, while the sum is 64.

The spelling of 56564257987 in words is "fifty-six billion, five hundred sixty-four million, two hundred fifty-seven thousand, nine hundred eighty-seven".