6642626399 has 2 divisors, whose sum is σ = 6642626400. Its totient is φ = 6642626398.

The previous prime is 6642626387. The next prime is 6642626467. The reversal of 6642626399 is 9936262466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6642626399 - 2⁸ = 6642626143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6642626399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6642656399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321313199 + 3321313200.

It is an arithmetic number, because the mean of its divisors is an integer number (3321313200).

Almost surely, 2^6642626399 is an apocalyptic number.

6642626399 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642626399 is an equidigital number, since it uses as much as digits as its factorization.

6642626399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 53.

The square root of 6642626399 is about 81502.3091636059. The cubic root of 6642626399 is about 1879.8070572136.

The spelling of 6642626399 in words is "six billion, six hundred forty-two million, six hundred twenty-six thousand, three hundred ninety-nine".