656312237161 has 9 divisors (see below), whose sum is σ = 763471852311. Its totient is φ = 562548485352.

The previous prime is 656312237051. The next prime is 656312237219. The reversal of 656312237161 is 161732213656.

The square root of 656312237161 is 810131.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 22766283225 + 633545953936 = 150885^2 + 795956^2 .

It is not a de Polignac number, because 656312237161 - 2¹⁷ = 656312106089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656312237261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5613051 + ... + 5728783.

Almost surely, 2^656312237161 is an apocalyptic number.

656312237161 is the 810131-st square number.

656312237161 is the 405066-th centered octagonal number.

It is an amenable number.

656312237161 is a deficient number, since it is larger than the sum of its proper divisors (107159615150).

656312237161 is an frugal number, since it uses more digits than its factorization.

656312237161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231480 (or 115740 counting only the distinct ones).

The product of its digits is 272160, while the sum is 43.

The spelling of 656312237161 in words is "six hundred fifty-six billion, three hundred twelve million, two hundred thirty-seven thousand, one hundred sixty-one".