656559157 has 2 divisors, whose sum is σ = 656559158. Its totient is φ = 656559156.

The previous prime is 656559149. The next prime is 656559187. The reversal of 656559157 is 751955656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508547601 + 148011556 = 22551^2 + 12166^2 .

It is a cyclic number.

It is not a de Polignac number, because 656559157 - 2³ = 656559149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656559157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656559107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328279578 + 328279579.

It is an arithmetic number, because the mean of its divisors is an integer number (328279579).

Almost surely, 2^656559157 is an apocalyptic number.

It is an amenable number.

656559157 is a deficient number, since it is larger than the sum of its proper divisors (1).

656559157 is an equidigital number, since it uses as much as digits as its factorization.

656559157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417500, while the sum is 49.

The square root of 656559157 is about 25623.4103311796. The cubic root of 656559157 is about 869.1431017627.

The spelling of 656559157 in words is "six hundred fifty-six million, five hundred fifty-nine thousand, one hundred fifty-seven".