199310971950 has 96 divisors (see below), whose sum is σ = 550488337920. Its totient is φ = 53026120800.

The previous prime is 199310971933. The next prime is 199310972017. The reversal of 199310971950 is 59179013991.

199310971950 is a `hidden beast` number, since 199 + 310 + 97 + 1 + 9 + 50 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 410577 + ... + 753123.

It is an arithmetic number, because the mean of its divisors is an integer number (5734253520).

Almost surely, 2^199310971950 is an apocalyptic number.

199310971950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 199310971950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275244168960).

199310971950 is an abundant number, since it is smaller than the sum of its proper divisors (351177365970).

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

199310971950 is a wasteful number, since it uses less digits than its factorization.

199310971950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342999 (or 342988 counting only the distinct ones).

The product of its (nonzero) digits is 688905, while the sum is 54.

The spelling of 199310971950 in words is "one hundred ninety-nine billion, three hundred ten million, nine hundred seventy-one thousand, nine hundred fifty".