16611295681 has 16 divisors (see below), whose sum is σ = 17951735808. Its totient is φ = 15331901200.

The previous prime is 16611295651. The next prime is 16611295717. The reversal of 16611295681 is 18659211661.

It is a de Polignac number, because none of the positive numbers 2^k-16611295681 is a prime.

It is a super-2 number, since 2×16611295681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16611295601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31465 + ... + 184966.

It is an arithmetic number, because the mean of its divisors is an integer number (1121983488).

Almost surely, 2^16611295681 is an apocalyptic number.

It is an amenable number.

16611295681 is a deficient number, since it is larger than the sum of its proper divisors (1340440127).

16611295681 is a wasteful number, since it uses less digits than its factorization.

16611295681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216572.

The product of its digits is 155520, while the sum is 46.

The spelling of 16611295681 in words is "sixteen billion, six hundred eleven million, two hundred ninety-five thousand, six hundred eighty-one".