15979985281 has 8 divisors (see below), whose sum is σ = 17466069824. Its totient is φ = 14530594320.

The previous prime is 15979985251. The next prime is 15979985293. The reversal of 15979985281 is 18258997951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15979985281 - 2¹⁹ = 15979460993 is a prime.

It is a super-2 number, since 2×15979985281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15979985251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9172485 + ... + 9174226.

It is an arithmetic number, because the mean of its divisors is an integer number (2183258728).

Almost surely, 2^15979985281 is an apocalyptic number.

It is an amenable number.

15979985281 is a deficient number, since it is larger than the sum of its proper divisors (1486084543).

15979985281 is a wasteful number, since it uses less digits than its factorization.

15979985281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18346791.

The product of its digits is 16329600, while the sum is 64.

The spelling of 15979985281 in words is "fifteen billion, nine hundred seventy-nine million, nine hundred eighty-five thousand, two hundred eighty-one".