16891161156 has 27 divisors (see below), whose sum is σ = 42699073053. Its totient is φ = 5630127120.

The previous prime is 16891161151. The next prime is 16891161167. The reversal of 16891161156 is 65116119861.

The square root of 16891161156 is 129966.

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

16891161156 is a `hidden beast` number, since 16 + 8 + 9 + 11 + 611 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5304791556 + 11586369600 = 72834^2 + 107640^2 .

It is a super-2 number, since 2×16891161156² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16891161151) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 768966 + ... + 790626.

Almost surely, 2^16891161156 is an apocalyptic number.

16891161156 is the 129966-th square number.

It is an amenable number.

16891161156 is an abundant number, since it is smaller than the sum of its proper divisors (25807911897).

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

16891161156 is an frugal number, since it uses more digits than its factorization.

16891161156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43332 (or 21666 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The spelling of 16891161156 in words is "sixteen billion, eight hundred ninety-one million, one hundred sixty-one thousand, one hundred fifty-six".