199799579850 has 48 divisors (see below), whose sum is σ = 533618575392. Its totient is φ = 49181434560.

The previous prime is 199799579849. The next prime is 199799579893. The reversal of 199799579850 is 58975997991.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51228712 + ... + 51232611.

It is an arithmetic number, because the mean of its divisors is an integer number (11117053654).

Almost surely, 2^199799579850 is an apocalyptic number.

199799579850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199799579850 is an abundant number, since it is smaller than the sum of its proper divisors (333818995542).

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

199799579850 is a wasteful number, since it uses less digits than its factorization.

199799579850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102461351 (or 102461346 counting only the distinct ones).

The product of its (nonzero) digits is 578680200, while the sum is 78.

The spelling of 199799579850 in words is "one hundred ninety-nine billion, seven hundred ninety-nine million, five hundred seventy-nine thousand, eight hundred fifty".