999809709122 has 24 divisors (see below), whose sum is σ = 1836385183440. Its totient is φ = 405937775880.

The previous prime is 999809709121. The next prime is 999809709163. The reversal of 999809709122 is 221907908999.

It is not an unprimeable number, because it can be changed into a prime (999809709121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268475504 + ... + 268479227.

It is an arithmetic number, because the mean of its divisors is an integer number (76516049310).

Almost surely, 2^999809709122 is an apocalyptic number.

999809709122 is a deficient number, since it is larger than the sum of its proper divisors (836575474318).

999809709122 is a wasteful number, since it uses less digits than its factorization.

999809709122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536954766 (or 536954759 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 65.

The spelling of 999809709122 in words is "nine hundred ninety-nine billion, eight hundred nine million, seven hundred nine thousand, one hundred twenty-two".