15816378368 has 108 divisors (see below), whose sum is σ = 36881203905. Its totient is φ = 6761373696.

The previous prime is 15816378367. The next prime is 15816378397. The reversal of 15816378368 is 86387361851.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 15344272384 + 472105984 = 123872^2 + 21728^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=88928.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (15816378367) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 39839546 + ... + 39839942.

Almost surely, 2^15816378368 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 15816378368

15816378368 is an abundant number, since it is smaller than the sum of its proper divisors (21064825537).

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

15816378368 is an frugal number, since it uses more digits than its factorization.

15816378368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 406 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The spelling of 15816378368 in words is "fifteen billion, eight hundred sixteen million, three hundred seventy-eight thousand, three hundred sixty-eight".