65691667 has 2 divisors, whose sum is σ = 65691668. Its totient is φ = 65691666.

The previous prime is 65691631. The next prime is 65691671. The reversal of 65691667 is 76619656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65691667 is a prime.

It is a super-2 number, since 2×65691667² = 8630790226477778, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65691617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32845833 + 32845834.

It is an arithmetic number, because the mean of its divisors is an integer number (32845834).

Almost surely, 2^65691667 is an apocalyptic number.

65691667 is a deficient number, since it is larger than the sum of its proper divisors (1).

65691667 is an equidigital number, since it uses as much as digits as its factorization.

65691667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 46.

The square root of 65691667 is about 8105.0396050852. The cubic root of 65691667 is about 403.4937025152.

The spelling of 65691667 in words is "sixty-five million, six hundred ninety-one thousand, six hundred sixty-seven".