18514739993 has 2 divisors, whose sum is σ = 18514739994. Its totient is φ = 18514739992.

The previous prime is 18514739989. The next prime is 18514740037. The reversal of 18514739993 is 39993741581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16592531344 + 1922208649 = 128812^2 + 43843^2 .

It is a cyclic number.

It is not a de Polignac number, because 18514739993 - 2² = 18514739989 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 (18514739953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9257369996 + 9257369997.

It is an arithmetic number, because the mean of its divisors is an integer number (9257369997).

Almost surely, 2^18514739993 is an apocalyptic number.

It is an amenable number.

18514739993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18514739993 is an equidigital number, since it uses as much as digits as its factorization.

18514739993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7348320, while the sum is 59.

The spelling of 18514739993 in words is "eighteen billion, five hundred fourteen million, seven hundred thirty-nine thousand, nine hundred ninety-three".