19999256120010 has 128 divisors (see below), whose sum is σ = 53595732879360. Its totient is φ = 5306719200768.

The previous prime is 19999256119967. The next prime is 19999256120029. The reversal of 19999256120010 is 1002165299991.

19999256120010 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 9 + 2 + 5 + 612 + 0 + 0 + 10 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 129554992 + ... + 129709268.

It is an arithmetic number, because the mean of its divisors is an integer number (418716663120).

Almost surely, 2^{19999256120010} is an apocalyptic number.

19999256120010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19999256120010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26797866439680).

19999256120010 is an abundant number, since it is smaller than the sum of its proper divisors (33596476759350).

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

19999256120010 is a wasteful number, since it uses less digits than its factorization.

19999256120010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156669 (or 156663 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 54.

The spelling of 19999256120010 in words is "nineteen trillion, nine hundred ninety-nine billion, two hundred fifty-six million, one hundred twenty thousand, ten".