656366645431 has 4 divisors (see below), whose sum is σ = 750133309072. Its totient is φ = 562599981792.

The previous prime is 656366645381. The next prime is 656366645443. The reversal of 656366645431 is 134546663656.

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

It is a cyclic number.

It is not a de Polignac number, because 656366645431 - 2¹³ = 656366637239 is a prime.

It is a super-2 number, since 2×656366645431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656366645471) 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, 46883331810 + ... + 46883331823.

It is an arithmetic number, because the mean of its divisors is an integer number (187533327268).

Almost surely, 2^656366645431 is an apocalyptic number.

656366645431 is a deficient number, since it is larger than the sum of its proper divisors (93766663641).

656366645431 is an equidigital number, since it uses as much as digits as its factorization.

656366645431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93766663640.

The product of its digits is 27993600, while the sum is 55.

The spelling of 656366645431 in words is "six hundred fifty-six billion, three hundred sixty-six million, six hundred forty-five thousand, four hundred thirty-one".