18661285 has 8 divisors (see below), whose sum is σ = 22709376. Its totient is φ = 14718480.

The previous prime is 18661277. The next prime is 18661289. The reversal of 18661285 is 58216681.

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

It is not a de Polignac number, because 18661285 - 2³ = 18661277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18661289) 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, 25929 + ... + 26638.

It is an arithmetic number, because the mean of its divisors is an integer number (2838672).

Almost surely, 2^18661285 is an apocalyptic number.

It is an amenable number.

18661285 is a deficient number, since it is larger than the sum of its proper divisors (4048091).

18661285 is an equidigital number, since it uses as much as digits as its factorization.

18661285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52643.

The product of its digits is 23040, while the sum is 37.

The square root of 18661285 is about 4319.8709471465. The cubic root of 18661285 is about 265.2449852672.

The spelling of 18661285 in words is "eighteen million, six hundred sixty-one thousand, two hundred eighty-five".