15399053568 has 108 divisors (see below), whose sum is σ = 44455726588. Its totient is φ = 5126492160.

The previous prime is 15399053507. The next prime is 15399053573. The reversal of 15399053568 is 86535099351.

It is a happy number.

15399053568 is a `hidden beast` number, since 1 + 539 + 9 + 0 + 53 + 56 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13315313664 + 2083739904 = 115392^2 + 45648^2 .

It is a super-3 number, since 3×15399053568³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2016798 + ... + 2024418.

Almost surely, 2^15399053568 is an apocalyptic number.

15399053568 is a gapful number since it is divisible by the number (18) 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 15399053568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22227863294).

15399053568 is an abundant number, since it is smaller than the sum of its proper divisors (29056673020).

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

15399053568 is an equidigital number, since it uses as much as digits as its factorization.

15399053568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8520 (or 8503 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 54.

The spelling of 15399053568 in words is "fifteen billion, three hundred ninety-nine million, fifty-three thousand, five hundred sixty-eight".