18511494413 has 2 divisors, whose sum is σ = 18511494414. Its totient is φ = 18511494412.

The previous prime is 18511494311. The next prime is 18511494427. The reversal of 18511494413 is 31449411581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15664524964 + 2846969449 = 125158^2 + 53357^2 .

It is a cyclic number.

It is not a de Polignac number, because 18511494413 - 2¹² = 18511490317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18511494433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9255747206 + 9255747207.

It is an arithmetic number, because the mean of its divisors is an integer number (9255747207).

Almost surely, 2^18511494413 is an apocalyptic number.

It is an amenable number.

18511494413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18511494413 is an equidigital number, since it uses as much as digits as its factorization.

18511494413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The spelling of 18511494413 in words is "eighteen billion, five hundred eleven million, four hundred ninety-four thousand, four hundred thirteen".