666692888957 has 2 divisors, whose sum is σ = 666692888958. Its totient is φ = 666692888956.

The previous prime is 666692888893. The next prime is 666692888963. The reversal of 666692888957 is 759888296666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575282808676 + 91410080281 = 758474^2 + 302341^2 .

It is a cyclic number.

It is not a de Polignac number, because 666692888957 - 2⁶ = 666692888893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666692888357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333346444478 + 333346444479.

It is an arithmetic number, because the mean of its divisors is an integer number (333346444479).

Almost surely, 2^666692888957 is an apocalyptic number.

It is an amenable number.

666692888957 is a deficient number, since it is larger than the sum of its proper divisors (1).

666692888957 is an equidigital number, since it uses as much as digits as its factorization.

666692888957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3762339840, while the sum is 80.

The spelling of 666692888957 in words is "six hundred sixty-six billion, six hundred ninety-two million, eight hundred eighty-eight thousand, nine hundred fifty-seven".