18665145 has 24 divisors (see below), whose sum is σ = 32675136. Its totient is φ = 9855648.

The previous prime is 18665137. The next prime is 18665147. The reversal of 18665145 is 54156681.

It is not a de Polignac number, because 18665145 - 2³ = 18665137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18665147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2622 + ... + 6648.

It is an arithmetic number, because the mean of its divisors is an integer number (1361464).

Almost surely, 2^18665145 is an apocalyptic number.

18665145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18665145 is a deficient number, since it is larger than the sum of its proper divisors (14009991).

18665145 is a wasteful number, since it uses less digits than its factorization.

18665145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4141 (or 4138 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 18665145 is about 4320.3176966515. The cubic root of 18665145 is about 265.2632722368.

The spelling of 18665145 in words is "eighteen million, six hundred sixty-five thousand, one hundred forty-five".