15979919761 has 16 divisors (see below), whose sum is σ = 17356791760. Its totient is φ = 14624686080.

The previous prime is 15979919741. The next prime is 15979919789. The reversal of 15979919761 is 16791997951.

It can be written as a sum of positive squares in 8 ways, for example, as 468462736 + 15511457025 = 21644^2 + 124545^2 .

It is a cyclic number.

It is not a de Polignac number, because 15979919761 - 2⁵ = 15979919729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15979919693 and 15979919702.

It is not an unprimeable number, because it can be changed into a prime (15979919741) 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, 706321 + ... + 728593.

It is an arithmetic number, because the mean of its divisors is an integer number (1084799485).

Almost surely, 2^15979919761 is an apocalyptic number.

It is an amenable number.

15979919761 is a deficient number, since it is larger than the sum of its proper divisors (1376871999).

15979919761 is a wasteful number, since it uses less digits than its factorization.

15979919761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22756.

The product of its digits is 9644670, while the sum is 64.

The spelling of 15979919761 in words is "fifteen billion, nine hundred seventy-nine million, nine hundred nineteen thousand, seven hundred sixty-one".