999997999806 has 32 divisors (see below), whose sum is σ = 2267201946240. Its totient is φ = 291497392224.

The previous prime is 999997999799. The next prime is 999997999811. The reversal of 999997999806 is 608999799999.

999997999806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 999997999806.

It is a congruent number.

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, 337379760 + ... + 337382723.

It is an arithmetic number, because the mean of its divisors is an integer number (70850060820).

Almost surely, 2^999997999806 is an apocalyptic number.

999997999806 is an abundant number, since it is smaller than the sum of its proper divisors (1267203946434).

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

999997999806 is a wasteful number, since it uses less digits than its factorization.

999997999806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674762520.

The product of its (nonzero) digits is 14463698256, while the sum is 93.

The spelling of 999997999806 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, eight hundred six".