18662161 has 8 divisors (see below), whose sum is σ = 22450880. Its totient is φ = 15154128.

The previous prime is 18662159. The next prime is 18662173. The reversal of 18662161 is 16126681.

18662161 = 121² + 122² + ... + 386².

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 18662161 - 2¹ = 18662159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18662561) 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, 70026 + ... + 70291.

It is an arithmetic number, because the mean of its divisors is an integer number (2806360).

Almost surely, 2^18662161 is an apocalyptic number.

It is an amenable number.

18662161 is a deficient number, since it is larger than the sum of its proper divisors (3788719).

18662161 is a wasteful number, since it uses less digits than its factorization.

18662161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140343.

The product of its digits is 3456, while the sum is 31.

The square root of 18662161 is about 4319.9723378744. The cubic root of 18662161 is about 265.2491355882.

The spelling of 18662161 in words is "eighteen million, six hundred sixty-two thousand, one hundred sixty-one".