199521750608 has 20 divisors (see below), whose sum is σ = 390558687540. Its totient is φ = 98732411904.

The previous prime is 199521750553. The next prime is 199521750619. The reversal of 199521750608 is 806057125991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 105853923904 + 93667826704 = 325352^2 + 306052^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 199521750608.

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, 64277363 + ... + 64280466.

It is an arithmetic number, because the mean of its divisors is an integer number (19527934377).

Almost surely, 2^199521750608 is an apocalyptic number.

It is an amenable number.

199521750608 is a deficient number, since it is larger than the sum of its proper divisors (191036936932).

199521750608 is a wasteful number, since it uses less digits than its factorization.

199521750608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128557934 (or 128557928 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 53.

The spelling of 199521750608 in words is "one hundred ninety-nine billion, five hundred twenty-one million, seven hundred fifty thousand, six hundred eight".