15395721216 has 104 divisors (see below), whose sum is σ = 41172552960. Its totient is φ = 5116624896.

The previous prime is 15395721179. The next prime is 15395721227. The reversal of 15395721216 is 61212759351.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4581745 + ... + 4585103.

Almost surely, 2^15395721216 is an apocalyptic number.

15395721216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15395721216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20586276480).

15395721216 is an abundant number, since it is smaller than the sum of its proper divisors (25776831744).

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

15395721216 is an equidigital number, since it uses as much as digits as its factorization.

15395721216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3759 (or 3737 counting only the distinct ones).

The product of its digits is 113400, while the sum is 42.

The spelling of 15395721216 in words is "fifteen billion, three hundred ninety-five million, seven hundred twenty-one thousand, two hundred sixteen".