19409864893 has 2 divisors, whose sum is σ = 19409864894. Its totient is φ = 19409864892.

The previous prime is 19409864879. The next prime is 19409864897. The reversal of 19409864893 is 39846890491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250505124 + 7159359769 = 110682^2 + 84613^2 .

It is a cyclic number.

It is not a de Polignac number, because 19409864893 - 2⁵ = 19409864861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19409864897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9704932446 + 9704932447.

It is an arithmetic number, because the mean of its divisors is an integer number (9704932447).

Almost surely, 2^19409864893 is an apocalyptic number.

It is an amenable number.

19409864893 is a deficient number, since it is larger than the sum of its proper divisors (1).

19409864893 is an equidigital number, since it uses as much as digits as its factorization.

19409864893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13436928, while the sum is 61.

The spelling of 19409864893 in words is "nineteen billion, four hundred nine million, eight hundred sixty-four thousand, eight hundred ninety-three".