19799855712 has 216 divisors, whose sum is σ = 70537639536. Its totient is φ = 5221891584.

The previous prime is 19799855707. The next prime is 19799855717. The reversal of 19799855712 is 21755899791.

19799855712 is a `hidden beast` number, since 1 + 9 + 79 + 9 + 8 + 557 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (19799855707) and next prime (19799855717).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 19799855712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19799855717) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 129493 + ... + 237419.

It is an arithmetic number, because the mean of its divisors is an integer number (326563146).

Almost surely, 2^19799855712 is an apocalyptic number.

19799855712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19799855712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35268819768).

19799855712 is an abundant number, since it is smaller than the sum of its proper divisors (50737783824).

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

19799855712 is a wasteful number, since it uses less digits than its factorization.

19799855712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107970 (or 107952 counting only the distinct ones).

The product of its digits is 14288400, while the sum is 63.

The spelling of 19799855712 in words is "nineteen billion, seven hundred ninety-nine million, eight hundred fifty-five thousand, seven hundred twelve".