15661960423 has 16 divisors (see below), whose sum is σ = 16487096256. Its totient is φ = 14849176320.

The previous prime is 15661960417. The next prime is 15661960427. The reversal of 15661960423 is 32406916651.

It is a cyclic number.

It is not a de Polignac number, because 15661960423 - 2¹³ = 15661952231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15661960423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661960427) 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, 2306293 + ... + 2313073.

It is an arithmetic number, because the mean of its divisors is an integer number (1030443516).

Almost surely, 2^15661960423 is an apocalyptic number.

15661960423 is a deficient number, since it is larger than the sum of its proper divisors (825135833).

15661960423 is a wasteful number, since it uses less digits than its factorization.

15661960423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7674.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 15661960423 in words is "fifteen billion, six hundred sixty-one million, nine hundred sixty thousand, four hundred twenty-three".