8638637826445 has 12 divisors (see below), whose sum is σ = 11394434687580. Its totient is φ = 6282645691520.

The previous prime is 8638637826439. The next prime is 8638637826457. The reversal of 8638637826445 is 5446287368368.

It can be written as a sum of positive squares in 2 ways, for example, as 1173710057641 + 7464927768804 = 1083379^2 + 2732202^2 .

It is not a de Polignac number, because 8638637826445 - 2⁹ = 8638637825933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7139369500 + ... + 7139370709.

It is an arithmetic number, because the mean of its divisors is an integer number (949536223965).

Almost surely, 2^{8638637826445} is an apocalyptic number.

It is an amenable number.

8638637826445 is a deficient number, since it is larger than the sum of its proper divisors (2755796861135).

8638637826445 is a wasteful number, since it uses less digits than its factorization.

8638637826445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14278740236 (or 14278740225 counting only the distinct ones).

The product of its digits is 1114767360, while the sum is 70.

The spelling of 8638637826445 in words is "eight trillion, six hundred thirty-eight billion, six hundred thirty-seven million, eight hundred twenty-six thousand, four hundred forty-five".