19999800126 has 32 divisors (see below), whose sum is σ = 44498899200. Its totient is φ = 6658365240.

The previous prime is 19999800061. The next prime is 19999800169. The reversal of 19999800126 is 62100899991.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184546 + ... + 272133.

It is an arithmetic number, because the mean of its divisors is an integer number (1390590600).

Almost surely, 2^19999800126 is an apocalyptic number.

19999800126 is an abundant number, since it is smaller than the sum of its proper divisors (24499099074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19999800126 is a wasteful number, since it uses less digits than its factorization.

19999800126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457501 (or 457495 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 54.

The spelling of 19999800126 in words is "nineteen billion, nine hundred ninety-nine million, eight hundred thousand, one hundred twenty-six".