656493973 has 2 divisors, whose sum is σ = 656493974. Its totient is φ = 656493972.

The previous prime is 656493919. The next prime is 656493983. The reversal of 656493973 is 379394656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 587238289 + 69255684 = 24233^2 + 8322^2 .

It is a cyclic number.

It is not a de Polignac number, because 656493973 - 2¹⁷ = 656362901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656493973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656493983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328246986 + 328246987.

It is an arithmetic number, because the mean of its divisors is an integer number (328246987).

Almost surely, 2^656493973 is an apocalyptic number.

It is an amenable number.

656493973 is a deficient number, since it is larger than the sum of its proper divisors (1).

656493973 is an equidigital number, since it uses as much as digits as its factorization.

656493973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 52.

The square root of 656493973 is about 25622.1383377734. The cubic root of 656493973 is about 869.1143376123.

The spelling of 656493973 in words is "six hundred fifty-six million, four hundred ninety-three thousand, nine hundred seventy-three".