16891122906 has 72 divisors (see below), whose sum is σ = 44040608820. Its totient is φ = 4659613056.

The previous prime is 16891122889. The next prime is 16891122943. The reversal of 16891122906 is 60922119861.

It can be written as a sum of positive squares in 2 ways, for example, as 16329006225 + 562116681 = 127785^2 + 23709^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 304611 + ... + 355766.

Almost surely, 2^16891122906 is an apocalyptic number.

16891122906 is an abundant number, since it is smaller than the sum of its proper divisors (27149485914).

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

16891122906 is a wasteful number, since it uses less digits than its factorization.

16891122906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660428 (or 660418 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 16891122906 in words is "sixteen billion, eight hundred ninety-one million, one hundred twenty-two thousand, nine hundred six".