16161139688464 has 45 divisors (see below), whose sum is σ = 33263012129277. Its totient is φ = 7605113563392.

The previous prime is 16161139688443. The next prime is 16161139688471. The reversal of 16161139688464 is 46488693116161.

The square root of 16161139688464 is 4020092.

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

16161139688464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12582202179600 + 3578937508864 = 3547140^2 + 1891808^2 .

It is a super-2 number, since 2×16161139688464² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16161139688396 and 16161139688405.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 273336697 + ... + 273395815.

Almost surely, 2^{16161139688464} is an apocalyptic number.

16161139688464 is the 4020092-nd square number.

It is an amenable number.

16161139688464 is an abundant number, since it is smaller than the sum of its proper divisors (17101872440813).

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

16161139688464 is an frugal number, since it uses more digits than its factorization.

16161139688464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118280 (or 59138 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 64.

The spelling of 16161139688464 in words is "sixteen trillion, one hundred sixty-one billion, one hundred thirty-nine million, six hundred eighty-eight thousand, four hundred sixty-four".