15371381816 has 64 divisors (see below), whose sum is σ = 33623424000. Its totient is φ = 6451256448.

The previous prime is 15371381801. The next prime is 15371381903. The reversal of 15371381816 is 61818317351.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1666385 + ... + 1675583.

It is an arithmetic number, because the mean of its divisors is an integer number (525366000).

Almost surely, 2^15371381816 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 15371381816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16811712000).

15371381816 is an abundant number, since it is smaller than the sum of its proper divisors (18252042184).

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

15371381816 is a wasteful number, since it uses less digits than its factorization.

15371381816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9828 (or 9824 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The spelling of 15371381816 in words is "fifteen billion, three hundred seventy-one million, three hundred eighty-one thousand, eight hundred sixteen".