6642636467 has 2 divisors, whose sum is σ = 6642636468. Its totient is φ = 6642636466.

The previous prime is 6642636397. The next prime is 6642636503. The reversal of 6642636467 is 7646362466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6642636467 - 2⁸ = 6642636211 is a prime.

It is not a weakly prime, because it can be changed into another prime (6642638467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321318233 + 3321318234.

It is an arithmetic number, because the mean of its divisors is an integer number (3321318234).

Almost surely, 2^6642636467 is an apocalyptic number.

6642636467 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642636467 is an equidigital number, since it uses as much as digits as its factorization.

6642636467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 50.

The square root of 6642636467 is about 81502.3709287037. The cubic root of 6642636467 is about 1879.8080069327.

The spelling of 6642636467 in words is "six billion, six hundred forty-two million, six hundred thirty-six thousand, four hundred sixty-seven".