66057967 has 2 divisors, whose sum is σ = 66057968. Its totient is φ = 66057966.

The previous prime is 66057961. The next prime is 66057991. The reversal of 66057967 is 76975066.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66057967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66057961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33028983 + 33028984.

It is an arithmetic number, because the mean of its divisors is an integer number (33028984).

Almost surely, 2^66057967 is an apocalyptic number.

66057967 is a deficient number, since it is larger than the sum of its proper divisors (1).

66057967 is an equidigital number, since it uses as much as digits as its factorization.

66057967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476280, while the sum is 46.

The square root of 66057967 is about 8127.6052438587. The cubic root of 66057967 is about 404.2422798458.

The spelling of 66057967 in words is "sixty-six million, fifty-seven thousand, nine hundred sixty-seven".