15990949539 has 6 divisors (see below), whose sum is σ = 23098038236. Its totient is φ = 10660633020.

The previous prime is 15990949523. The next prime is 15990949561. The reversal of 15990949539 is 93594909951.

15990949539 is a `hidden beast` number, since 1 + 5 + 9 + 9 + 0 + 94 + 9 + 539 = 666.

It is not a de Polignac number, because 15990949539 - 2⁴ = 15990949523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15990949739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 888386077 + ... + 888386094.

Almost surely, 2^15990949539 is an apocalyptic number.

15990949539 is a deficient number, since it is larger than the sum of its proper divisors (7107088697).

15990949539 is a wasteful number, since it uses less digits than its factorization.

15990949539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776772177 (or 1776772174 counting only the distinct ones).

The product of its (nonzero) digits is 17714700, while the sum is 63.

The spelling of 15990949539 in words is "fifteen billion, nine hundred ninety million, nine hundred forty-nine thousand, five hundred thirty-nine".