199780211720 has 128 divisors (see below), whose sum is σ = 482499439200. Its totient is φ = 74180198400.

The previous prime is 199780211713. The next prime is 199780211831. The reversal of 199780211720 is 27112087991.

It can be written as a sum of positive squares in 16 ways, for example, as 3391198756 + 196389012964 = 58234^2 + 443158^2 .

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, 25475000 + ... + 25482840.

Almost surely, 2^199780211720 is an apocalyptic number.

199780211720 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 199780211720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241249719600).

199780211720 is an abundant number, since it is smaller than the sum of its proper divisors (282719227480).

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

199780211720 is a wasteful number, since it uses less digits than its factorization.

199780211720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8379 (or 8375 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 199780211720 in words is "one hundred ninety-nine billion, seven hundred eighty million, two hundred eleven thousand, seven hundred twenty".