656501497 has 2 divisors, whose sum is σ = 656501498. Its totient is φ = 656501496.

The previous prime is 656501473. The next prime is 656501543. The reversal of 656501497 is 794105656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652087296 + 4414201 = 25536^2 + 2101^2 .

It is a cyclic number.

It is not a de Polignac number, because 656501497 - 2⁷ = 656501369 is a prime.

It is not a weakly prime, because it can be changed into another prime (656505497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328250748 + 328250749.

It is an arithmetic number, because the mean of its divisors is an integer number (328250749).

Almost surely, 2^656501497 is an apocalyptic number.

It is an amenable number.

656501497 is a deficient number, since it is larger than the sum of its proper divisors (1).

656501497 is an equidigital number, since it uses as much as digits as its factorization.

656501497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 656501497 is about 25622.2851635056. The cubic root of 656501497 is about 869.1176578719.

The spelling of 656501497 in words is "six hundred fifty-six million, five hundred one thousand, four hundred ninety-seven".