15491862638 has 12 divisors (see below), whose sum is σ = 27031719672. Its totient is φ = 6639369660.

The previous prime is 15491862623. The next prime is 15491862649. The reversal of 15491862638 is 83626819451.

15491862638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 15491862638.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 79040018 + ... + 79040213.

It is an arithmetic number, because the mean of its divisors is an integer number (2252643306).

Almost surely, 2^15491862638 is an apocalyptic number.

15491862638 is a deficient number, since it is larger than the sum of its proper divisors (11539857034).

15491862638 is a wasteful number, since it uses less digits than its factorization.

15491862638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158080247 (or 158080240 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 53.

The spelling of 15491862638 in words is "fifteen billion, four hundred ninety-one million, eight hundred sixty-two thousand, six hundred thirty-eight".