199965797020 has 96 divisors (see below), whose sum is σ = 465929553600. Its totient is φ = 71474227200.

The previous prime is 199965796981. The next prime is 199965797033. The reversal of 199965797020 is 20797569991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24004216 + ... + 24012544.

It is an arithmetic number, because the mean of its divisors is an integer number (4853432850).

Almost surely, 2^199965797020 is an apocalyptic number.

199965797020 is a gapful number since it is divisible by the number (10) 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 199965797020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232964776800).

199965797020 is an abundant number, since it is smaller than the sum of its proper divisors (265963756580).

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

199965797020 is a wasteful number, since it uses less digits than its factorization.

199965797020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10199 (or 10197 counting only the distinct ones).

The product of its (nonzero) digits is 19289340, while the sum is 64.

The spelling of 199965797020 in words is "one hundred ninety-nine billion, nine hundred sixty-five million, seven hundred ninety-seven thousand, twenty".