15813747138 has 64 divisors (see below), whose sum is σ = 36477665280. Its totient is φ = 4476814272.

The previous prime is 15813747121. The next prime is 15813747161. The reversal of 15813747138 is 83174731851.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5668648 + ... + 5671436.

It is an arithmetic number, because the mean of its divisors is an integer number (569963520).

Almost surely, 2^15813747138 is an apocalyptic number.

15813747138 is an abundant number, since it is smaller than the sum of its proper divisors (20663918142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15813747138 is a wasteful number, since it uses less digits than its factorization.

15813747138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991.

The product of its digits is 564480, while the sum is 48.

The spelling of 15813747138 in words is "fifteen billion, eight hundred thirteen million, seven hundred forty-seven thousand, one hundred thirty-eight".