656934565225 has 27 divisors (see below), whose sum is σ = 832540901317. Its totient is φ = 514216652480.

The previous prime is 656934565219. The next prime is 656934565249. The reversal of 656934565225 is 522565439656.

The square root of 656934565225 is 810515.

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

It can be written as a sum of positive squares in 4 ways, for example, as 374068015321 + 282866549904 = 611611^2 + 531852^2 .

It is not a de Polignac number, because 656934565225 - 2¹¹ = 656934563177 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 656934565225.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 190469301 + ... + 190472749.

Almost surely, 2^656934565225 is an apocalyptic number.

656934565225 is the 810515-th square number.

656934565225 is the 405258-th centered octagonal number.

It is an amenable number.

656934565225 is a deficient number, since it is larger than the sum of its proper divisors (175606336092).

656934565225 is an frugal number, since it uses more digits than its factorization.

656934565225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7002 (or 3501 counting only the distinct ones).

The product of its digits is 58320000, while the sum is 58.

The spelling of 656934565225 in words is "six hundred fifty-six billion, nine hundred thirty-four million, five hundred sixty-five thousand, two hundred twenty-five".