56172778395 has 16 divisors (see below), whose sum is σ = 91107631392. Its totient is φ = 29548419840.

The previous prime is 56172778381. The next prime is 56172778427. The reversal of 56172778395 is 59387727165.

It is a happy number.

It is not a de Polignac number, because 56172778395 - 2¹² = 56172774299 is a prime.

It is a super-2 number, since 2×56172778395² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25648576 + ... + 25650765.

It is an arithmetic number, because the mean of its divisors is an integer number (5694226962).

Almost surely, 2^56172778395 is an apocalyptic number.

56172778395 is a deficient number, since it is larger than the sum of its proper divisors (34934852997).

56172778395 is a wasteful number, since it uses less digits than its factorization.

56172778395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51299422.

The product of its digits is 22226400, while the sum is 60.

The spelling of 56172778395 in words is "fifty-six billion, one hundred seventy-two million, seven hundred seventy-eight thousand, three hundred ninety-five".