18690451919 has 2 divisors, whose sum is σ = 18690451920. Its totient is φ = 18690451918.

The previous prime is 18690451907. The next prime is 18690451979. The reversal of 18690451919 is 91915409681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18690451919 - 2²⁴ = 18673674703 is a prime.

It is a super-2 number, since 2×18690451919² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18690451979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9345225959 + 9345225960.

It is an arithmetic number, because the mean of its divisors is an integer number (9345225960).

Almost surely, 2^18690451919 is an apocalyptic number.

18690451919 is a deficient number, since it is larger than the sum of its proper divisors (1).

18690451919 is an equidigital number, since it uses as much as digits as its factorization.

18690451919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 53.

The spelling of 18690451919 in words is "eighteen billion, six hundred ninety million, four hundred fifty-one thousand, nine hundred nineteen".