15661933401 has 16 divisors (see below), whose sum is σ = 21614074560. Its totient is φ = 10075920960.

The previous prime is 15661933393. The next prime is 15661933423. The reversal of 15661933401 is 10433916651.

It is not a de Polignac number, because 15661933401 - 2³ = 15661933393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15661933401.

It is not an unprimeable number, because it can be changed into a prime (15661933481) 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, 121606 + ... + 214736.

It is an arithmetic number, because the mean of its divisors is an integer number (1350879660).

Almost surely, 2^15661933401 is an apocalyptic number.

It is an amenable number.

15661933401 is a deficient number, since it is larger than the sum of its proper divisors (5952141159).

15661933401 is a wasteful number, since it uses less digits than its factorization.

15661933401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95096.

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 15661933401 in words is "fifteen billion, six hundred sixty-one million, nine hundred thirty-three thousand, four hundred one".