63639406667 has 2 divisors, whose sum is σ = 63639406668. Its totient is φ = 63639406666.

The previous prime is 63639406591. The next prime is 63639406669. The reversal of 63639406667 is 76660493636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63639406667 - 2²⁸ = 63370971211 is a prime.

Together with 63639406669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63639406669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31819703333 + 31819703334.

It is an arithmetic number, because the mean of its divisors is an integer number (31819703334).

Almost surely, 2^63639406667 is an apocalyptic number.

63639406667 is a deficient number, since it is larger than the sum of its proper divisors (1).

63639406667 is an equidigital number, since it uses as much as digits as its factorization.

63639406667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17635968, while the sum is 56.

The spelling of 63639406667 in words is "sixty-three billion, six hundred thirty-nine million, four hundred six thousand, six hundred sixty-seven".