66831967 has 2 divisors, whose sum is σ = 66831968. Its totient is φ = 66831966.

The previous prime is 66831931. The next prime is 66831971. The reversal of 66831967 is 76913866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66831967 - 2⁷ = 66831839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66831907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33415983 + 33415984.

It is an arithmetic number, because the mean of its divisors is an integer number (33415984).

Almost surely, 2^66831967 is an apocalyptic number.

66831967 is a deficient number, since it is larger than the sum of its proper divisors (1).

66831967 is an equidigital number, since it uses as much as digits as its factorization.

66831967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 66831967 is about 8175.0820790987. The cubic root of 66831967 is about 405.8149864394.

The spelling of 66831967 in words is "sixty-six million, eight hundred thirty-one thousand, nine hundred sixty-seven".