646572767 has 2 divisors, whose sum is σ = 646572768. Its totient is φ = 646572766.

The previous prime is 646572761. The next prime is 646572791. The reversal of 646572767 is 767275646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646572767 - 2²⁸ = 378137311 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 (646572761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323286383 + 323286384.

It is an arithmetic number, because the mean of its divisors is an integer number (323286384).

Almost surely, 2^646572767 is an apocalyptic number.

646572767 is a deficient number, since it is larger than the sum of its proper divisors (1).

646572767 is an equidigital number, since it uses as much as digits as its factorization.

646572767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 50.

The square root of 646572767 is about 25427.7951659203. The cubic root of 646572767 is about 864.7139584577.

The spelling of 646572767 in words is "six hundred forty-six million, five hundred seventy-two thousand, seven hundred sixty-seven".