19949155199 has 2 divisors, whose sum is σ = 19949155200. Its totient is φ = 19949155198.

The previous prime is 19949155183. The next prime is 19949155243. The reversal of 19949155199 is 99155194991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19949155199 - 2⁴ = 19949155183 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19949155139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9974577599 + 9974577600.

It is an arithmetic number, because the mean of its divisors is an integer number (9974577600).

Almost surely, 2^19949155199 is an apocalyptic number.

19949155199 is a deficient number, since it is larger than the sum of its proper divisors (1).

19949155199 is an equidigital number, since it uses as much as digits as its factorization.

19949155199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5904900, while the sum is 62.

The spelling of 19949155199 in words is "nineteen billion, nine hundred forty-nine million, one hundred fifty-five thousand, one hundred ninety-nine".