18534374249 has 2 divisors, whose sum is σ = 18534374250. Its totient is φ = 18534374248.

The previous prime is 18534374153. The next prime is 18534374251. The reversal of 18534374249 is 94247343581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12319890025 + 6214484224 = 110995^2 + 78832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18534374249 is a prime.

Together with 18534374251, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18534374197 and 18534374206.

It is not a weakly prime, because it can be changed into another prime (18534379249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9267187124 + 9267187125.

It is an arithmetic number, because the mean of its divisors is an integer number (9267187125).

Almost surely, 2^18534374249 is an apocalyptic number.

It is an amenable number.

18534374249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18534374249 is an equidigital number, since it uses as much as digits as its factorization.

18534374249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 50.

The spelling of 18534374249 in words is "eighteen billion, five hundred thirty-four million, three hundred seventy-four thousand, two hundred forty-nine".