666959688971 has 2 divisors, whose sum is σ = 666959688972. Its totient is φ = 666959688970.

The previous prime is 666959688953. The next prime is 666959689009. The reversal of 666959688971 is 179886959666.

666959688971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666959688971 - 2⁶ = 666959688907 is a prime.

It is not a weakly prime, because it can be changed into another prime (666959688911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333479844485 + 333479844486.

It is an arithmetic number, because the mean of its divisors is an integer number (333479844486).

Almost surely, 2^666959688971 is an apocalyptic number.

666959688971 is a deficient number, since it is larger than the sum of its proper divisors (1).

666959688971 is an equidigital number, since it uses as much as digits as its factorization.

666959688971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116316160, while the sum is 80.

The spelling of 666959688971 in words is "six hundred sixty-six billion, nine hundred fifty-nine million, six hundred eighty-eight thousand, nine hundred seventy-one".