15915997746 has 128 divisors (see below), whose sum is σ = 40573716480. Its totient is φ = 4577601600.

The previous prime is 15915997733. The next prime is 15915997781. The reversal of 15915997746 is 64779951951.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1785276 + ... + 1794168.

It is an arithmetic number, because the mean of its divisors is an integer number (316982160).

Almost surely, 2^15915997746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15915997746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20286858240).

15915997746 is an abundant number, since it is smaller than the sum of its proper divisors (24657718734).

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

15915997746 is a wasteful number, since it uses less digits than its factorization.

15915997746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9069 (or 9063 counting only the distinct ones).

The product of its digits is 21432600, while the sum is 63.

The spelling of 15915997746 in words is "fifteen billion, nine hundred fifteen million, nine hundred ninety-seven thousand, seven hundred forty-six".