67664951 has 2 divisors, whose sum is σ = 67664952. Its totient is φ = 67664950.

The previous prime is 67664939. The next prime is 67664953. The reversal of 67664951 is 15946676.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67664951 is a prime.

Together with 67664953, 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 (67664953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33832475 + 33832476.

It is an arithmetic number, because the mean of its divisors is an integer number (33832476).

Almost surely, 2^67664951 is an apocalyptic number.

67664951 is a deficient number, since it is larger than the sum of its proper divisors (1).

67664951 is an equidigital number, since it uses as much as digits as its factorization.

67664951 is an evil number, because the sum of its binary digits is even.

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

The square root of 67664951 is about 8225.8708353584. The cubic root of 67664951 is about 407.4940363211.

The spelling of 67664951 in words is "sixty-seven million, six hundred sixty-four thousand, nine hundred fifty-one".