18668025 has 36 divisors (see below), whose sum is σ = 34601580. Its totient is φ = 9609600.

The previous prime is 18668021. The next prime is 18668033. The reversal of 18668025 is 52086681.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 186624 + 18481401 = 432^2 + 4299^2 .

It is not a de Polignac number, because 18668025 - 2² = 18668021 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18668021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5095 + ... + 7955.

It is an arithmetic number, because the mean of its divisors is an integer number (961155).

Almost surely, 2^18668025 is an apocalyptic number.

18668025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18668025 is a deficient number, since it is larger than the sum of its proper divisors (15933555).

18668025 is a wasteful number, since it uses less digits than its factorization.

18668025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906 (or 2898 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 18668025 is about 4320.6509926167. The cubic root of 18668025 is about 265.2769147585.

The spelling of 18668025 in words is "eighteen million, six hundred sixty-eight thousand, twenty-five".