15656161661166 has 64 divisors (see below), whose sum is σ = 34480080165888. Its totient is φ = 4709083198848.

The previous prime is 15656161661149. The next prime is 15656161661219. The reversal of 15656161661166 is 66116616165651.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449776 + ... + 5613788.

It is an arithmetic number, because the mean of its divisors is an integer number (538751252592).

Almost surely, 2^{15656161661166} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15656161661166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17240040082944).

15656161661166 is an abundant number, since it is smaller than the sum of its proper divisors (18823918504722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15656161661166 is a wasteful number, since it uses less digits than its factorization.

15656161661166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5164905.

The product of its digits is 6998400, while the sum is 57.

The spelling of 15656161661166 in words is "fifteen trillion, six hundred fifty-six billion, one hundred sixty-one million, six hundred sixty-one thousand, one hundred sixty-six".