656330161 has 4 divisors (see below), whose sum is σ = 674068852. Its totient is φ = 638591472.

The previous prime is 656330131. The next prime is 656330201. The reversal of 656330161 is 161033656.

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 491464561 + 164865600 = 22169^2 + 12840^2 .

It is a cyclic number.

It is not a de Polignac number, because 656330161 - 2¹³ = 656321969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656330131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8869290 + ... + 8869363.

It is an arithmetic number, because the mean of its divisors is an integer number (168517213).

Almost surely, 2^656330161 is an apocalyptic number.

It is an amenable number.

656330161 is a deficient number, since it is larger than the sum of its proper divisors (17738691).

656330161 is a wasteful number, since it uses less digits than its factorization.

656330161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17738690.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 656330161 is about 25618.9414496384. The cubic root of 656330161 is about 869.0420428632.

The spelling of 656330161 in words is "six hundred fifty-six million, three hundred thirty thousand, one hundred sixty-one".