656256553 has 2 divisors, whose sum is σ = 656256554. Its totient is φ = 656256552.

The previous prime is 656256551. The next prime is 656256649. The reversal of 656256553 is 355652656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585494809 + 70761744 = 24197^2 + 8412^2 .

It is a cyclic number.

It is not a de Polignac number, because 656256553 - 2¹ = 656256551 is a prime.

Together with 656256551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (656256551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328128276 + 328128277.

It is an arithmetic number, because the mean of its divisors is an integer number (328128277).

Almost surely, 2^656256553 is an apocalyptic number.

It is an amenable number.

656256553 is a deficient number, since it is larger than the sum of its proper divisors (1).

656256553 is an equidigital number, since it uses as much as digits as its factorization.

656256553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810000, while the sum is 43.

The square root of 656256553 is about 25617.5048160433. The cubic root of 656256553 is about 869.0095537076.

The spelling of 656256553 in words is "six hundred fifty-six million, two hundred fifty-six thousand, five hundred fifty-three".