19995608999 has 2 divisors, whose sum is σ = 19995609000. Its totient is φ = 19995608998.

The previous prime is 19995608989. The next prime is 19995609017. The reversal of 19995608999 is 99980659991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19995608999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19995608989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997804499 + 9997804500.

It is an arithmetic number, because the mean of its divisors is an integer number (9997804500).

Almost surely, 2^19995608999 is an apocalyptic number.

19995608999 is a deficient number, since it is larger than the sum of its proper divisors (1).

19995608999 is an equidigital number, since it uses as much as digits as its factorization.

19995608999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127545840, while the sum is 74.

The spelling of 19995608999 in words is "nineteen billion, nine hundred ninety-five million, six hundred eight thousand, nine hundred ninety-nine".