16851668351850 has 72 divisors (see below), whose sum is σ = 45312767472492. Its totient is φ = 4490011296000.

The previous prime is 16851668351831. The next prime is 16851668351911. The reversal of 16851668351850 is 5815386615861.

16851668351850 is a `hidden beast` number, since 1 + 6 + 8 + 5 + 1 + 6 + 68 + 3 + 518 + 50 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 8823983129361 + 8027685222489 = 2970519^2 + 2833317^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15158101 + ... + 16231800.

Almost surely, 2^{16851668351850} is an apocalyptic number.

16851668351850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16851668351850 is an abundant number, since it is smaller than the sum of its proper divisors (28461099120642).

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

16851668351850 is a wasteful number, since it uses less digits than its factorization.

16851668351850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31391112 (or 31391104 counting only the distinct ones).

The product of its (nonzero) digits is 41472000, while the sum is 63.

The spelling of 16851668351850 in words is "sixteen trillion, eight hundred fifty-one billion, six hundred sixty-eight million, three hundred fifty-one thousand, eight hundred fifty".