6636994669 has 2 divisors, whose sum is σ = 6636994670. Its totient is φ = 6636994668.

The previous prime is 6636994643. The next prime is 6636994753. The reversal of 6636994669 is 9664996366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6619937769 + 17056900 = 81363^2 + 4130^2 .

It is a cyclic number.

It is not a de Polignac number, because 6636994669 - 2⁷ = 6636994541 is a prime.

It is a super-2 number, since 2×6636994669² = 88099396472668839122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6636994669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6636994619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3318497334 + 3318497335.

It is an arithmetic number, because the mean of its divisors is an integer number (3318497335).

Almost surely, 2^6636994669 is an apocalyptic number.

It is an amenable number.

6636994669 is a deficient number, since it is larger than the sum of its proper divisors (1).

6636994669 is an equidigital number, since it uses as much as digits as its factorization.

6636994669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68024448, while the sum is 64.

The square root of 6636994669 is about 81467.7523256902. The cubic root of 6636994669 is about 1879.2756630333.

The spelling of 6636994669 in words is "six billion, six hundred thirty-six million, nine hundred ninety-four thousand, six hundred sixty-nine".