18677455193 has 2 divisors, whose sum is σ = 18677455194. Its totient is φ = 18677455192.

The previous prime is 18677455177. The next prime is 18677455207. The reversal of 18677455193 is 39155477681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18552619264 + 124835929 = 136208^2 + 11173^2 .

It is a cyclic number.

It is not a de Polignac number, because 18677455193 - 2⁴ = 18677455177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18677455123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9338727596 + 9338727597.

It is an arithmetic number, because the mean of its divisors is an integer number (9338727597).

Almost surely, 2^18677455193 is an apocalyptic number.

It is an amenable number.

18677455193 is a deficient number, since it is larger than the sum of its proper divisors (1).

18677455193 is an equidigital number, since it uses as much as digits as its factorization.

18677455193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 56.

The spelling of 18677455193 in words is "eighteen billion, six hundred seventy-seven million, four hundred fifty-five thousand, one hundred ninety-three".