18690332459 has 2 divisors, whose sum is σ = 18690332460. Its totient is φ = 18690332458.

The previous prime is 18690332443. The next prime is 18690332483. The reversal of 18690332459 is 95423309681.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18690332459 - 2⁴ = 18690332443 is a prime.

It is not a weakly prime, because it can be changed into another prime (18690332359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9345166229 + 9345166230.

It is an arithmetic number, because the mean of its divisors is an integer number (9345166230).

Almost surely, 2^18690332459 is an apocalyptic number.

18690332459 is a deficient number, since it is larger than the sum of its proper divisors (1).

18690332459 is an equidigital number, since it uses as much as digits as its factorization.

18690332459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 18690332459 in words is "eighteen billion, six hundred ninety million, three hundred thirty-two thousand, four hundred fifty-nine".