56561605311 has 4 divisors (see below), whose sum is σ = 75415473752. Its totient is φ = 37707736872.

The previous prime is 56561605277. The next prime is 56561605319. The reversal of 56561605311 is 11350616565.

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

It is not a de Polignac number, because 56561605311 - 2⁷ = 56561605183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56561605311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561605319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9426934216 + ... + 9426934221.

It is an arithmetic number, because the mean of its divisors is an integer number (18853868438).

Almost surely, 2^56561605311 is an apocalyptic number.

56561605311 is a deficient number, since it is larger than the sum of its proper divisors (18853868441).

56561605311 is a wasteful number, since it uses less digits than its factorization.

56561605311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18853868440.

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 56561605311 in words is "fifty-six billion, five hundred sixty-one million, six hundred five thousand, three hundred eleven".