656736775061 has 4 divisors (see below), whose sum is σ = 657177835500. Its totient is φ = 656295714624.

The previous prime is 656736774997. The next prime is 656736775063. The reversal of 656736775061 is 160577637656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 244693462225 + 412043312836 = 494665^2 + 641906^2 .

It is a cyclic number.

It is not a de Polignac number, because 656736775061 - 2⁶ = 656736774997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656736775063) 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, 220527986 + ... + 220530963.

It is an arithmetic number, because the mean of its divisors is an integer number (164294458875).

Almost surely, 2^656736775061 is an apocalyptic number.

It is an amenable number.

656736775061 is a deficient number, since it is larger than the sum of its proper divisors (441060439).

656736775061 is a wasteful number, since it uses less digits than its factorization.

656736775061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441060438.

The product of its (nonzero) digits is 33339600, while the sum is 59.

The spelling of 656736775061 in words is "six hundred fifty-six billion, seven hundred thirty-six million, seven hundred seventy-five thousand, sixty-one".