56513390878 has 8 divisors (see below), whose sum is σ = 96880098672. Its totient is φ = 24220024656.

The previous prime is 56513390809. The next prime is 56513390909. The reversal of 56513390878 is 87809331565.

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

It is a super-2 number, since 2×56513390878² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 2018335375 + ... + 2018335402.

It is an arithmetic number, because the mean of its divisors is an integer number (12110012334).

Almost surely, 2^56513390878 is an apocalyptic number.

56513390878 is a deficient number, since it is larger than the sum of its proper divisors (40366707794).

56513390878 is a wasteful number, since it uses less digits than its factorization.

56513390878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036670786.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 56513390878 in words is "fifty-six billion, five hundred thirteen million, three hundred ninety thousand, eight hundred seventy-eight".