66958967 has 2 divisors, whose sum is σ = 66958968. Its totient is φ = 66958966.

The previous prime is 66958949. The next prime is 66959017. The reversal of 66958967 is 76985966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66958967 - 2⁸ = 66958711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66988967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33479483 + 33479484.

It is an arithmetic number, because the mean of its divisors is an integer number (33479484).

Almost surely, 2^66958967 is an apocalyptic number.

66958967 is a deficient number, since it is larger than the sum of its proper divisors (1).

66958967 is an equidigital number, since it uses as much as digits as its factorization.

66958967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 56.

The square root of 66958967 is about 8182.8458985857. The cubic root of 66958967 is about 406.0718789317.

The spelling of 66958967 in words is "sixty-six million, nine hundred fifty-eight thousand, nine hundred sixty-seven".