15984967681 has 4 divisors (see below), whose sum is σ = 15985246000. Its totient is φ = 15984689364.

The previous prime is 15984967679. The next prime is 15984967693. The reversal of 15984967681 is 18676948951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15984967681 - 2¹ = 15984967679 is a prime.

It is a super-2 number, since 2×15984967681² (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 (15984967381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17631 + ... + 179668.

It is an arithmetic number, because the mean of its divisors is an integer number (3996311500).

Almost surely, 2^15984967681 is an apocalyptic number.

It is an amenable number.

15984967681 is a deficient number, since it is larger than the sum of its proper divisors (278319).

15984967681 is an equidigital number, since it uses as much as digits as its factorization.

15984967681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278318.

The product of its digits is 26127360, while the sum is 64.

The spelling of 15984967681 in words is "fifteen billion, nine hundred eighty-four million, nine hundred sixty-seven thousand, six hundred eighty-one".