199724912105 has 16 divisors (see below), whose sum is σ = 244795461120. Its totient is φ = 156363613632.

The previous prime is 199724912053. The next prime is 199724912111. The reversal of 199724912105 is 501219427991.

It is a cyclic number.

It is not a de Polignac number, because 199724912105 - 2⁸ = 199724911849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2443031 + ... + 2523459.

It is an arithmetic number, because the mean of its divisors is an integer number (15299716320).

Almost surely, 2^199724912105 is an apocalyptic number.

It is an amenable number.

199724912105 is a deficient number, since it is larger than the sum of its proper divisors (45070549015).

199724912105 is a wasteful number, since it uses less digits than its factorization.

199724912105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91048.

The product of its (nonzero) digits is 408240, while the sum is 50.

The spelling of 199724912105 in words is "one hundred ninety-nine billion, seven hundred twenty-four million, nine hundred twelve thousand, one hundred five".