13638415491 has 24 divisors (see below), whose sum is σ = 20147512320. Its totient is φ = 8886249456.

The previous prime is 13638415463. The next prime is 13638415493. The reversal of 13638415491 is 19451483631.

13638415491 is a `hidden beast` number, since 1 + 3 + 63 + 8 + 41 + 549 + 1 = 666.

13638415491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13638415491 - 2²⁵ = 13604861059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13638415493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281716 + ... + 326558.

It is an arithmetic number, because the mean of its divisors is an integer number (839479680).

Almost surely, 2^13638415491 is an apocalyptic number.

13638415491 is a deficient number, since it is larger than the sum of its proper divisors (6509096829).

13638415491 is a wasteful number, since it uses less digits than its factorization.

13638415491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45615 (or 45612 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 13638415491 in words is "thirteen billion, six hundred thirty-eight million, four hundred fifteen thousand, four hundred ninety-one".