19106330861 has 2 divisors, whose sum is σ = 19106330862. Its totient is φ = 19106330860.

The previous prime is 19106330857. The next prime is 19106330891. The reversal of 19106330861 is 16803360191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19018064836 + 88266025 = 137906^2 + 9395^2 .

It is a cyclic number.

It is not a de Polignac number, because 19106330861 - 2² = 19106330857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19106330891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9553165430 + 9553165431.

It is an arithmetic number, because the mean of its divisors is an integer number (9553165431).

Almost surely, 2^19106330861 is an apocalyptic number.

It is an amenable number.

19106330861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19106330861 is an equidigital number, since it uses as much as digits as its factorization.

19106330861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 19106330861 in words is "nineteen billion, one hundred six million, three hundred thirty thousand, eight hundred sixty-one".