15964971193161 has 27 divisors (see below), whose sum is σ = 23205697446477. Its totient is φ = 10576723142520.

The previous prime is 15964971193141. The next prime is 15964971193183. The reversal of 15964971193161 is 16139117946951.

The square root of 15964971193161 is 3995619.

It is a perfect power (a square), and thus also a powerful number.

15964971193161 is a `hidden beast` number, since 1 + 59 + 6 + 497 + 1 + 1 + 9 + 31 + 61 = 666.

15964971193161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15964971193161 - 2¹⁹ = 15964970668873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15964971193141) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1953853606 + ... + 1953861776.

Almost surely, 2^{15964971193161} is an apocalyptic number.

15964971193161 is the 3995619-th square number.

15964971193161 is the 1997810-th centered octagonal number.

It is an amenable number.

15964971193161 is a deficient number, since it is larger than the sum of its proper divisors (7240726253316).

15964971193161 is an frugal number, since it uses more digits than its factorization.

15964971193161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16674 (or 8337 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 63.

The spelling of 15964971193161 in words is "fifteen trillion, nine hundred sixty-four billion, nine hundred seventy-one million, one hundred ninety-three thousand, one hundred sixty-one".