19158719117 has 2 divisors, whose sum is σ = 19158719118. Its totient is φ = 19158719116.

The previous prime is 19158719089. The next prime is 19158719119. The reversal of 19158719117 is 71191785191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11249996356 + 7908722761 = 106066^2 + 88931^2 .

It is a cyclic number.

It is not a de Polignac number, because 19158719117 - 2¹² = 19158715021 is a prime.

Together with 19158719119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19158719119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9579359558 + 9579359559.

It is an arithmetic number, because the mean of its divisors is an integer number (9579359559).

Almost surely, 2^19158719117 is an apocalyptic number.

It is an amenable number.

19158719117 is a deficient number, since it is larger than the sum of its proper divisors (1).

19158719117 is an equidigital number, since it uses as much as digits as its factorization.

19158719117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 50.

The spelling of 19158719117 in words is "nineteen billion, one hundred fifty-eight million, seven hundred nineteen thousand, one hundred seventeen".