19999694807835 has 32 divisors (see below), whose sum is σ = 34013671958592. Its totient is φ = 9999999959040.

The previous prime is 19999694807831. The next prime is 19999694807879. The reversal of 19999694807835 is 53870849699991.

It is not a de Polignac number, because 19999694807835 - 2² = 19999694807831 is a prime.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152522356 + ... + 152653425.

It is an arithmetic number, because the mean of its divisors is an integer number (1062927248706).

Almost surely, 2^{19999694807835} is an apocalyptic number.

19999694807835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19999694807835 is a deficient number, since it is larger than the sum of its proper divisors (14013977150757).

19999694807835 is a wasteful number, since it uses less digits than its factorization.

19999694807835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305176063.

The product of its (nonzero) digits is 9523422720, while the sum is 87.

The spelling of 19999694807835 in words is "nineteen trillion, nine hundred ninety-nine billion, six hundred ninety-four million, eight hundred seven thousand, eight hundred thirty-five".