199561290916 has 24 divisors (see below), whose sum is σ = 376206808824. Its totient is φ = 92078142720.

The previous prime is 199561290893. The next prime is 199561290961. The reversal of 199561290916 is 619092165991.

It can be written as a sum of positive squares in 4 ways, for example, as 109729212516 + 89832078400 = 331254^2 + 299720^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 384745 + ... + 739696.

It is an arithmetic number, because the mean of its divisors is an integer number (15675283701).

Almost surely, 2^199561290916 is an apocalyptic number.

It is an amenable number.

199561290916 is a deficient number, since it is larger than the sum of its proper divisors (176645517908).

199561290916 is a wasteful number, since it uses less digits than its factorization.

199561290916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127871 (or 1127869 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 58.

The spelling of 199561290916 in words is "one hundred ninety-nine billion, five hundred sixty-one million, two hundred ninety thousand, nine hundred sixteen".