18661475 has 12 divisors (see below), whose sum is σ = 26446224. Its totient is φ = 12796320.

The previous prime is 18661469. The next prime is 18661481. The reversal of 18661475 is 57416681.

It is an interprime number because it is at equal distance from previous prime (18661469) and next prime (18661481).

It is not a de Polignac number, because 18661475 - 2¹⁴ = 18645091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53144 + ... + 53493.

It is an arithmetic number, because the mean of its divisors is an integer number (2203852).

Almost surely, 2^18661475 is an apocalyptic number.

18661475 is a deficient number, since it is larger than the sum of its proper divisors (7784749).

18661475 is a wasteful number, since it uses less digits than its factorization.

18661475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106654 (or 106649 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 18661475 is about 4319.8929384882. The cubic root of 18661475 is about 265.2458854620.

The spelling of 18661475 in words is "eighteen million, six hundred sixty-one thousand, four hundred seventy-five".