15317649816 has 128 divisors (see below), whose sum is σ = 45229916160. Its totient is φ = 4230288000.

The previous prime is 15317649769. The next prime is 15317649827. The reversal of 15317649816 is 61894671351.

It is a happy number.

It is a congruent number.

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, 7555795 + ... + 7557821.

It is an arithmetic number, because the mean of its divisors is an integer number (353358720).

Almost surely, 2^15317649816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15317649816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22614958080).

15317649816 is an abundant number, since it is smaller than the sum of its proper divisors (29912266344).

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

15317649816 is a wasteful number, since it uses less digits than its factorization.

15317649816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3525 (or 3521 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The spelling of 15317649816 in words is "fifteen billion, three hundred seventeen million, six hundred forty-nine thousand, eight hundred sixteen".