19935645911 has 2 divisors, whose sum is σ = 19935645912. Its totient is φ = 19935645910.

The previous prime is 19935645809. The next prime is 19935645953. The reversal of 19935645911 is 11954653991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19935645911 - 2²² = 19931451607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19935645011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9967822955 + 9967822956.

It is an arithmetic number, because the mean of its divisors is an integer number (9967822956).

Almost surely, 2^19935645911 is an apocalyptic number.

19935645911 is a deficient number, since it is larger than the sum of its proper divisors (1).

19935645911 is an equidigital number, since it uses as much as digits as its factorization.

19935645911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1312200, while the sum is 53.

The spelling of 19935645911 in words is "nineteen billion, nine hundred thirty-five million, six hundred forty-five thousand, nine hundred eleven".