15728916665 has 16 divisors (see below), whose sum is σ = 23532094080. Its totient is φ = 9805038720.

The previous prime is 15728916653. The next prime is 15728916667. The reversal of 15728916665 is 56661982751.

It is not a de Polignac number, because 15728916665 - 2¹⁰ = 15728915641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15728916665.

It is not an unprimeable number, because it can be changed into a prime (15728916667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20426780 + ... + 20427549.

It is an arithmetic number, because the mean of its divisors is an integer number (1470755880).

Almost surely, 2^15728916665 is an apocalyptic number.

It is an amenable number.

15728916665 is a deficient number, since it is larger than the sum of its proper divisors (7803177415).

15728916665 is a wasteful number, since it uses less digits than its factorization.

15728916665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40854352.

The product of its digits is 5443200, while the sum is 56.

The spelling of 15728916665 in words is "fifteen billion, seven hundred twenty-eight million, nine hundred sixteen thousand, six hundred sixty-five".