64646667727 has 2 divisors, whose sum is σ = 64646667728. Its totient is φ = 64646667726.

The previous prime is 64646667721. The next prime is 64646667791. The reversal of 64646667727 is 72776664646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64646667727 - 2⁷ = 64646667599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64646667721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32323333863 + 32323333864.

It is an arithmetic number, because the mean of its divisors is an integer number (32323333864).

Almost surely, 2^64646667727 is an apocalyptic number.

64646667727 is a deficient number, since it is larger than the sum of its proper divisors (1).

64646667727 is an equidigital number, since it uses as much as digits as its factorization.

64646667727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85349376, while the sum is 61.

The spelling of 64646667727 in words is "sixty-four billion, six hundred forty-six million, six hundred sixty-seven thousand, seven hundred twenty-seven".