66415967 has 2 divisors, whose sum is σ = 66415968. Its totient is φ = 66415966.

The previous prime is 66415931. The next prime is 66415969. The reversal of 66415967 is 76951466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66415967 - 2⁶ = 66415903 is a prime.

It is a super-2 number, since 2×66415967² = 8822161345090178, which contains 22 as substring.

Together with 66415969, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66415969) 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, 33207983 + 33207984.

It is an arithmetic number, because the mean of its divisors is an integer number (33207984).

Almost surely, 2^66415967 is an apocalyptic number.

66415967 is a deficient number, since it is larger than the sum of its proper divisors (1).

66415967 is an equidigital number, since it uses as much as digits as its factorization.

66415967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 66415967 is about 8149.5991925984. The cubic root of 66415967 is about 404.9712259189.

The spelling of 66415967 in words is "sixty-six million, four hundred fifteen thousand, nine hundred sixty-seven".