18739714849 has 2 divisors, whose sum is σ = 18739714850. Its totient is φ = 18739714848.

The previous prime is 18739714843. The next prime is 18739714859. The reversal of 18739714849 is 94841793781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11292887824 + 7446827025 = 106268^2 + 86295^2 .

It is a cyclic number.

It is not a de Polignac number, because 18739714849 - 2³ = 18739714841 is a prime.

It is not a weakly prime, because it can be changed into another prime (18739714841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369857424 + 9369857425.

It is an arithmetic number, because the mean of its divisors is an integer number (9369857425).

Almost surely, 2^18739714849 is an apocalyptic number.

It is an amenable number.

18739714849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18739714849 is an equidigital number, since it uses as much as digits as its factorization.

18739714849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 61.

The spelling of 18739714849 in words is "eighteen billion, seven hundred thirty-nine million, seven hundred fourteen thousand, eight hundred forty-nine".