19999694807836 has 24 divisors (see below), whose sum is σ = 35321083182000. Its totient is φ = 9907959464064.

The previous prime is 19999694807831. The next prime is 19999694807879. The reversal of 19999694807836 is 63870849699991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999694807831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33000960 + ... + 33601528.

It is an arithmetic number, because the mean of its divisors is an integer number (1471711799250).

Almost surely, 2^{19999694807836} is an apocalyptic number.

It is an amenable number.

19999694807836 is a deficient number, since it is larger than the sum of its proper divisors (15321388374164).

19999694807836 is a wasteful number, since it uses less digits than its factorization.

19999694807836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677061 (or 677059 counting only the distinct ones).

The product of its (nonzero) digits is 11428107264, while the sum is 88.

The spelling of 19999694807836 in words is "nineteen trillion, nine hundred ninety-nine billion, six hundred ninety-four million, eight hundred seven thousand, eight hundred thirty-six".