18664253 has 2 divisors, whose sum is σ = 18664254. Its totient is φ = 18664252.

The previous prime is 18664229. The next prime is 18664259. The reversal of 18664253 is 35246681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17081689 + 1582564 = 4133^2 + 1258^2 .

It is a cyclic number.

It is not a de Polignac number, because 18664253 - 2¹² = 18660157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18664259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332126 + 9332127.

It is an arithmetic number, because the mean of its divisors is an integer number (9332127).

Almost surely, 2^18664253 is an apocalyptic number.

It is an amenable number.

18664253 is a deficient number, since it is larger than the sum of its proper divisors (1).

18664253 is an equidigital number, since it uses as much as digits as its factorization.

18664253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 18664253 is about 4320.2144622692. The cubic root of 18664253 is about 265.2590465601.

The spelling of 18664253 in words is "eighteen million, six hundred sixty-four thousand, two hundred fifty-three".