646136167 has 2 divisors, whose sum is σ = 646136168. Its totient is φ = 646136166.

The previous prime is 646136149. The next prime is 646136203. The reversal of 646136167 is 761631646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646136167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646136137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323068083 + 323068084.

It is an arithmetic number, because the mean of its divisors is an integer number (323068084).

Almost surely, 2^646136167 is an apocalyptic number.

646136167 is a deficient number, since it is larger than the sum of its proper divisors (1).

646136167 is an equidigital number, since it uses as much as digits as its factorization.

646136167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The square root of 646136167 is about 25419.2086226145. The cubic root of 646136167 is about 864.5192811569.

The spelling of 646136167 in words is "six hundred forty-six million, one hundred thirty-six thousand, one hundred sixty-seven".