656064257 has 4 divisors (see below), whose sum is σ = 656184276. Its totient is φ = 655944240.

The previous prime is 656064229. The next prime is 656064271. The reversal of 656064257 is 752460656.

656064257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 376204816 + 279859441 = 19396^2 + 16729^2 .

It is a cyclic number.

It is not a de Polignac number, because 656064257 - 2⁶ = 656064193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656064217) 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, 51398 + ... + 62879.

It is an arithmetic number, because the mean of its divisors is an integer number (164046069).

Almost surely, 2^656064257 is an apocalyptic number.

It is an amenable number.

656064257 is a deficient number, since it is larger than the sum of its proper divisors (120019).

656064257 is a wasteful number, since it uses less digits than its factorization.

656064257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120018.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 656064257 is about 25613.7513261920. The cubic root of 656064257 is about 868.9246664863.

The spelling of 656064257 in words is "six hundred fifty-six million, sixty-four thousand, two hundred fifty-seven".