18493408651 has 2 divisors, whose sum is σ = 18493408652. Its totient is φ = 18493408650.

The previous prime is 18493408603. The next prime is 18493408679. The reversal of 18493408651 is 15680439481.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18493408651 - 2²⁵ = 18459854219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18493408595 and 18493408604.

It is not a weakly prime, because it can be changed into another prime (18493408601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9246704325 + 9246704326.

It is an arithmetic number, because the mean of its divisors is an integer number (9246704326).

Almost surely, 2^18493408651 is an apocalyptic number.

18493408651 is a deficient number, since it is larger than the sum of its proper divisors (1).

18493408651 is an equidigital number, since it uses as much as digits as its factorization.

18493408651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 18493408651 in words is "eighteen billion, four hundred ninety-three million, four hundred eight thousand, six hundred fifty-one".