199978730320 has 20 divisors (see below), whose sum is σ = 464950548180. Its totient is φ = 79991492096.

The previous prime is 199978730311. The next prime is 199978730333. The reversal of 199978730320 is 23037879991.

It can be written as a sum of positive squares in 2 ways, for example, as 51608934976 + 148369795344 = 227176^2 + 385188^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1249866985 + ... + 1249867144.

It is an arithmetic number, because the mean of its divisors is an integer number (23247527409).

Almost surely, 2^199978730320 is an apocalyptic number.

199978730320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

199978730320 is an abundant number, since it is smaller than the sum of its proper divisors (264971817860).

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

199978730320 is a wasteful number, since it uses less digits than its factorization.

199978730320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499734142 (or 2499734136 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 58.

The spelling of 199978730320 in words is "one hundred ninety-nine billion, nine hundred seventy-eight million, seven hundred thirty thousand, three hundred twenty".