664065767 has 2 divisors, whose sum is σ = 664065768. Its totient is φ = 664065766.

The previous prime is 664065737. The next prime is 664065799. The reversal of 664065767 is 767560466.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664065767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664065737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332032883 + 332032884.

It is an arithmetic number, because the mean of its divisors is an integer number (332032884).

Almost surely, 2^664065767 is an apocalyptic number.

664065767 is a deficient number, since it is larger than the sum of its proper divisors (1).

664065767 is an equidigital number, since it uses as much as digits as its factorization.

664065767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The square root of 664065767 is about 25769.4735491434. The cubic root of 664065767 is about 872.4429365832.

The spelling of 664065767 in words is "six hundred sixty-four million, sixty-five thousand, seven hundred sixty-seven".