6642514639 has 2 divisors, whose sum is σ = 6642514640. Its totient is φ = 6642514638.

The previous prime is 6642514631. The next prime is 6642514649. The reversal of 6642514639 is 9364152466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6642514639 - 2³ = 6642514631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6642514631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321257319 + 3321257320.

It is an arithmetic number, because the mean of its divisors is an integer number (3321257320).

Almost surely, 2^6642514639 is an apocalyptic number.

6642514639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642514639 is an equidigital number, since it uses as much as digits as its factorization.

6642514639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 46.

The square root of 6642514639 is about 81501.6235359763. The cubic root of 6642514639 is about 1879.7965147764.

The spelling of 6642514639 in words is "six billion, six hundred forty-two million, five hundred fourteen thousand, six hundred thirty-nine".