8636872639 has 2 divisors, whose sum is σ = 8636872640. Its totient is φ = 8636872638.

The previous prime is 8636872591. The next prime is 8636872679. The reversal of 8636872639 is 9362786368.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8636872639 - 2¹⁹ = 8636348351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8636872679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4318436319 + 4318436320.

It is an arithmetic number, because the mean of its divisors is an integer number (4318436320).

Almost surely, 2^8636872639 is an apocalyptic number.

8636872639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8636872639 is an equidigital number, since it uses as much as digits as its factorization.

8636872639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 58.

The square root of 8636872639 is about 92934.7762627102. The cubic root of 8636872639 is about 2051.7235268712.

The spelling of 8636872639 in words is "eight billion, six hundred thirty-six million, eight hundred seventy-two thousand, six hundred thirty-nine".