19840637099 has 2 divisors, whose sum is σ = 19840637100. Its totient is φ = 19840637098.

The previous prime is 19840637029. The next prime is 19840637101. The reversal of 19840637099 is 99073604891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19840637099 is a prime.

Together with 19840637101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19840637029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9920318549 + 9920318550.

It is an arithmetic number, because the mean of its divisors is an integer number (9920318550).

Almost surely, 2^19840637099 is an apocalyptic number.

19840637099 is a deficient number, since it is larger than the sum of its proper divisors (1).

19840637099 is an equidigital number, since it uses as much as digits as its factorization.

19840637099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The spelling of 19840637099 in words is "nineteen billion, eight hundred forty million, six hundred thirty-seven thousand, ninety-nine".