16611881 has 8 divisors (see below), whose sum is σ = 19516224. Its totient is φ = 13939920.

The previous prime is 16611851. The next prime is 16611899. The reversal of 16611881 is 18811661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16611881 is a prime.

It is a super-2 number, since 2×16611881² = 551909180716322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16611811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57941 + ... + 58226.

It is an arithmetic number, because the mean of its divisors is an integer number (2439528).

Almost surely, 2^16611881 is an apocalyptic number.

16611881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16611881 is a deficient number, since it is larger than the sum of its proper divisors (2904343).

16611881 is a wasteful number, since it uses less digits than its factorization.

16611881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116191.

The product of its digits is 2304, while the sum is 32.

The square root of 16611881 is about 4075.7675350785. The cubic root of 16611881 is about 255.1562850752.

The spelling of 16611881 in words is "sixteen million, six hundred eleven thousand, eight hundred eighty-one".