18660959 has 2 divisors, whose sum is σ = 18660960. Its totient is φ = 18660958.

The previous prime is 18660953. The next prime is 18661009. The reversal of 18660959 is 95906681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18660959 - 2⁸ = 18660703 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18660953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9330479 + 9330480.

It is an arithmetic number, because the mean of its divisors is an integer number (9330480).

Almost surely, 2^18660959 is an apocalyptic number.

18660959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18660959 is an equidigital number, since it uses as much as digits as its factorization.

18660959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 18660959 is about 4319.8332143730. The cubic root of 18660959 is about 265.2434407081.

The spelling of 18660959 in words is "eighteen million, six hundred sixty thousand, nine hundred fifty-nine".