19218495997 has 2 divisors, whose sum is σ = 19218495998. Its totient is φ = 19218495996.

The previous prime is 19218495913. The next prime is 19218496019. The reversal of 19218495997 is 79959481291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13657661956 + 5560834041 = 116866^2 + 74571^2 .

It is a cyclic number.

It is not a de Polignac number, because 19218495997 - 2¹⁹ = 19217971709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19218495697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9609247998 + 9609247999.

It is an arithmetic number, because the mean of its divisors is an integer number (9609247999).

Almost surely, 2^19218495997 is an apocalyptic number.

It is an amenable number.

19218495997 is a deficient number, since it is larger than the sum of its proper divisors (1).

19218495997 is an equidigital number, since it uses as much as digits as its factorization.

19218495997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 64.

The spelling of 19218495997 in words is "nineteen billion, two hundred eighteen million, four hundred ninety-five thousand, nine hundred ninety-seven".