18661445 has 16 divisors (see below), whose sum is σ = 24615360. Its totient is φ = 13468800.

The previous prime is 18661429. The next prime is 18661457. The reversal of 18661445 is 54416681.

It is not a de Polignac number, because 18661445 - 2⁴ = 18661429 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6425 + ... + 8865.

It is an arithmetic number, because the mean of its divisors is an integer number (1538460).

Almost surely, 2^18661445 is an apocalyptic number.

It is an amenable number.

18661445 is a deficient number, since it is larger than the sum of its proper divisors (5953915).

18661445 is a wasteful number, since it uses less digits than its factorization.

18661445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596.

The product of its digits is 23040, while the sum is 35.

The square root of 18661445 is about 4319.8894661785. The cubic root of 18661445 is about 265.2457433264.

The spelling of 18661445 in words is "eighteen million, six hundred sixty-one thousand, four hundred forty-five".