19699545599 has 4 divisors (see below), whose sum is σ = 19701193680. Its totient is φ = 19697897520.

The previous prime is 19699545589. The next prime is 19699545611. The reversal of 19699545599 is 99554599691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19699545599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19699545539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805979 + ... + 830060.

It is an arithmetic number, because the mean of its divisors is an integer number (4925298420).

Almost surely, 2^19699545599 is an apocalyptic number.

19699545599 is a deficient number, since it is larger than the sum of its proper divisors (1648081).

19699545599 is a wasteful number, since it uses less digits than its factorization.

19699545599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648080.

The product of its digits is 177147000, while the sum is 71.

The spelling of 19699545599 in words is "nineteen billion, six hundred ninety-nine million, five hundred forty-five thousand, five hundred ninety-nine".