56173519978 has 8 divisors (see below), whose sum is σ = 84284140068. Its totient is φ = 28078806624.

The previous prime is 56173519937. The next prime is 56173520017. The reversal of 56173519978 is 87991537165.

It can be written as a sum of positive squares in 2 ways, for example, as 43415139769 + 12758380209 = 208363^2 + 112953^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3967851 + ... + 3981982.

Almost surely, 2^56173519978 is an apocalyptic number.

56173519978 is a deficient number, since it is larger than the sum of its proper divisors (28110620090).

56173519978 is a wasteful number, since it uses less digits than its factorization.

56173519978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7953368.

The product of its digits is 14288400, while the sum is 61.

The spelling of 56173519978 in words is "fifty-six billion, one hundred seventy-three million, five hundred nineteen thousand, nine hundred seventy-eight".