18119661 has 16 divisors (see below), whose sum is σ = 28176000. Its totient is φ = 10353504.

The previous prime is 18119659. The next prime is 18119683. The reversal of 18119661 is 16691181.

It is not a de Polignac number, because 18119661 - 2¹ = 18119659 is a prime.

It is a super-2 number, since 2×18119661² = 656644229509842, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18119261) 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, 7776 + ... + 9833.

It is an arithmetic number, because the mean of its divisors is an integer number (1761000).

Almost surely, 2^18119661 is an apocalyptic number.

It is an amenable number.

18119661 is a deficient number, since it is larger than the sum of its proper divisors (10056339).

18119661 is an equidigital number, since it uses as much as digits as its factorization.

18119661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17633 (or 17619 counting only the distinct ones).

The product of its digits is 2592, while the sum is 33.

The square root of 18119661 is about 4256.7195115488. The cubic root of 18119661 is about 262.6535989946.

The spelling of 18119661 in words is "eighteen million, one hundred nineteen thousand, six hundred sixty-one".