18255619493 has 2 divisors, whose sum is σ = 18255619494. Its totient is φ = 18255619492.

The previous prime is 18255619469. The next prime is 18255619517. The reversal of 18255619493 is 39491655281.

It is a balanced prime because it is at equal distance from previous prime (18255619469) and next prime (18255619517).

It can be written as a sum of positive squares in only one way, i.e., 17935102084 + 320517409 = 133922^2 + 17903^2 .

It is a cyclic number.

It is not a de Polignac number, because 18255619493 - 2⁶ = 18255619429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18255619433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9127809746 + 9127809747.

It is an arithmetic number, because the mean of its divisors is an integer number (9127809747).

Almost surely, 2^18255619493 is an apocalyptic number.

It is an amenable number.

18255619493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18255619493 is an equidigital number, since it uses as much as digits as its factorization.

18255619493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 53.

The spelling of 18255619493 in words is "eighteen billion, two hundred fifty-five million, six hundred nineteen thousand, four hundred ninety-three".