199816996806 has 60 divisors (see below), whose sum is σ = 505063020852. Its totient is φ = 57090558168.

The previous prime is 199816996777. The next prime is 199816996823. The reversal of 199816996806 is 608699618991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2268516 + ... + 2354951.

Almost surely, 2^199816996806 is an apocalyptic number.

199816996806 is an abundant number, since it is smaller than the sum of its proper divisors (305246024046).

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

199816996806 is an equidigital number, since it uses as much as digits as its factorization.

199816996806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623503 (or 4623479 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 72.

The spelling of 199816996806 in words is "one hundred ninety-nine billion, eight hundred sixteen million, nine hundred ninety-six thousand, eight hundred six".