15709991616 has 336 divisors, whose sum is σ = 53121519360. Its totient is φ = 4386908160.

The previous prime is 15709991603. The next prime is 15709991623. The reversal of 15709991616 is 61619990751.

It is a happy number.

15709991616 is a `hidden beast` number, since 1 + 570 + 9 + 9 + 9 + 1 + 61 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4452445 + ... + 4455971.

It is an arithmetic number, because the mean of its divisors is an integer number (158099760).

Almost surely, 2^15709991616 is an apocalyptic number.

15709991616 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 15709991616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26560759680).

15709991616 is an abundant number, since it is smaller than the sum of its proper divisors (37411527744).

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

15709991616 is a wasteful number, since it uses less digits than its factorization.

15709991616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612 (or 3599 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 54.

The spelling of 15709991616 in words is "fifteen billion, seven hundred nine million, nine hundred ninety-one thousand, six hundred sixteen".