18708481849 has 2 divisors, whose sum is σ = 18708481850. Its totient is φ = 18708481848.

The previous prime is 18708481843. The next prime is 18708481853. The reversal of 18708481849 is 94818480781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13649716224 + 5058765625 = 116832^2 + 71125^2 .

It is a cyclic number.

It is not a de Polignac number, because 18708481849 - 2⁷ = 18708481721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18708481793 and 18708481802.

It is not a weakly prime, because it can be changed into another prime (18708481843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354240924 + 9354240925.

It is an arithmetic number, because the mean of its divisors is an integer number (9354240925).

Almost surely, 2^18708481849 is an apocalyptic number.

It is an amenable number.

18708481849 is a deficient number, since it is larger than the sum of its proper divisors (1).

18708481849 is an equidigital number, since it uses as much as digits as its factorization.

18708481849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4128768, while the sum is 58.

The spelling of 18708481849 in words is "eighteen billion, seven hundred eight million, four hundred eighty-one thousand, eight hundred forty-nine".