56611617778 has 8 divisors (see below), whose sum is σ = 88609488768. Its totient is φ = 27075121524.

The previous prime is 56611617757. The next prime is 56611617781. The reversal of 56611617778 is 87771611665.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615343626 + ... + 615343717.

It is an arithmetic number, because the mean of its divisors is an integer number (11076186096).

Almost surely, 2^56611617778 is an apocalyptic number.

56611617778 is a deficient number, since it is larger than the sum of its proper divisors (31997870990).

56611617778 is a wasteful number, since it uses less digits than its factorization.

56611617778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230687368.

The product of its digits is 2963520, while the sum is 55.

The spelling of 56611617778 in words is "fifty-six billion, six hundred eleven million, six hundred seventeen thousand, seven hundred seventy-eight".