656589673 has 2 divisors, whose sum is σ = 656589674. Its totient is φ = 656589672.

The previous prime is 656589613. The next prime is 656589683. The reversal of 656589673 is 376985656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643281769 + 13307904 = 25363^2 + 3648^2 .

It is a cyclic number.

It is not a de Polignac number, because 656589673 - 2²¹ = 654492521 is a prime.

It is a super-2 number, since 2×656589673² = 862219997380493858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656589613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328294836 + 328294837.

It is an arithmetic number, because the mean of its divisors is an integer number (328294837).

Almost surely, 2^656589673 is an apocalyptic number.

It is an amenable number.

656589673 is a deficient number, since it is larger than the sum of its proper divisors (1).

656589673 is an equidigital number, since it uses as much as digits as its factorization.

656589673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 55.

The square root of 656589673 is about 25624.0057953475. The cubic root of 656589673 is about 869.1565670941.

The spelling of 656589673 in words is "six hundred fifty-six million, five hundred eighty-nine thousand, six hundred seventy-three".