16155504010881 has 45 divisors (see below), whose sum is σ = 24267362381779. Its totient is φ = 10710937447056.

The previous prime is 16155504010879. The next prime is 16155504010907. The reversal of 16155504010881 is 18801040555161.

The square root of 16155504010881 is 4019391.

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

16155504010881 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 550 + 4 + 0 + 10 + 8 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15829138602225 + 326365408656 = 3978585^2 + 571284^2 .

It is not a de Polignac number, because 16155504010881 - 2¹ = 16155504010879 is a prime.

It is a super-2 number, since 2×16155504010881² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16155504010381) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 7126379110 + ... + 7126381376.

Almost surely, 2^{16155504010881} is an apocalyptic number.

16155504010881 is the 4019391-st square number.

16155504010881 is the 2009696-th centered octagonal number.

It is an amenable number.

16155504010881 is a deficient number, since it is larger than the sum of its proper divisors (8111858370898).

16155504010881 is an frugal number, since it uses more digits than its factorization.

16155504010881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4940 (or 2467 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 45.

The spelling of 16155504010881 in words is "sixteen trillion, one hundred fifty-five billion, five hundred four million, ten thousand, eight hundred eighty-one".