99638836155 has 64 divisors (see below), whose sum is σ = 184290508800. Its totient is φ = 51021290880.

The previous prime is 99638836133. The next prime is 99638836169. The reversal of 99638836155 is 55163883699.

99638836155 is a `hidden beast` number, since 9 + 9 + 6 + 3 + 8 + 8 + 3 + 615 + 5 = 666.

It is not a de Polignac number, because 99638836155 - 2³¹ = 97491352507 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 99638836092 and 99638836101.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 437761 + ... + 625229.

It is an arithmetic number, because the mean of its divisors is an integer number (2879539200).

Almost surely, 2^99638836155 is an apocalyptic number.

99638836155 is a deficient number, since it is larger than the sum of its proper divisors (84651672645).

99638836155 is a wasteful number, since it uses less digits than its factorization.

99638836155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187641 (or 187635 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 63.

The spelling of 99638836155 in words is "ninety-nine billion, six hundred thirty-eight million, eight hundred thirty-six thousand, one hundred fifty-five".