18622661 has 8 divisors (see below), whose sum is σ = 19496448. Its totient is φ = 17766000.

The previous prime is 18622613. The next prime is 18622673. The reversal of 18622661 is 16622681.

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

It is a cyclic number.

It is not a de Polignac number, because 18622661 - 2¹⁰ = 18621637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18622861) 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, 2030 + ... + 6431.

It is an arithmetic number, because the mean of its divisors is an integer number (2437056).

Almost surely, 2^18622661 is an apocalyptic number.

It is an amenable number.

18622661 is a deficient number, since it is larger than the sum of its proper divisors (873787).

18622661 is an equidigital number, since it uses as much as digits as its factorization.

18622661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8563.

The product of its digits is 6912, while the sum is 32.

The square root of 18622661 is about 4315.3981276355. The cubic root of 18622661 is about 265.0618628565.

The spelling of 18622661 in words is "eighteen million, six hundred twenty-two thousand, six hundred sixty-one".