19905259417 has 2 divisors, whose sum is σ = 19905259418. Its totient is φ = 19905259416.

The previous prime is 19905259393. The next prime is 19905259441. The reversal of 19905259417 is 71495250991.

It is a balanced prime because it is at equal distance from previous prime (19905259393) and next prime (19905259441).

It can be written as a sum of positive squares in only one way, i.e., 16855569241 + 3049690176 = 129829^2 + 55224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19905259417 is a prime.

It is not a weakly prime, because it can be changed into another prime (19905259487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9952629708 + 9952629709.

It is an arithmetic number, because the mean of its divisors is an integer number (9952629709).

Almost surely, 2^19905259417 is an apocalyptic number.

It is an amenable number.

19905259417 is a deficient number, since it is larger than the sum of its proper divisors (1).

19905259417 is an equidigital number, since it uses as much as digits as its factorization.

19905259417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The spelling of 19905259417 in words is "nineteen billion, nine hundred five million, two hundred fifty-nine thousand, four hundred seventeen".