659951623 has 2 divisors, whose sum is σ = 659951624. Its totient is φ = 659951622.

The previous prime is 659951597. The next prime is 659951651. The reversal of 659951623 is 326159956.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-659951623 is a prime.

It is a super-2 number, since 2×659951623² = 871072289400668258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (659951683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329975811 + 329975812.

It is an arithmetic number, because the mean of its divisors is an integer number (329975812).

Almost surely, 2^659951623 is an apocalyptic number.

659951623 is a deficient number, since it is larger than the sum of its proper divisors (1).

659951623 is an equidigital number, since it uses as much as digits as its factorization.

659951623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437400, while the sum is 46.

The square root of 659951623 is about 25689.5236039908. The cubic root of 659951623 is about 870.6374959414.

The spelling of 659951623 in words is "six hundred fifty-nine million, nine hundred fifty-one thousand, six hundred twenty-three".