16851666668450 has 24 divisors (see below), whose sum is σ = 31478624059428. Its totient is φ = 6711736762880.

The previous prime is 16851666668449. The next prime is 16851666668497. The reversal of 16851666668450 is 5486666615861.

It can be written as a sum of positive squares in 6 ways, for example, as 8041200161401 + 8810466507049 = 2835701^2 + 2968243^2 .

It is a hoax number, since the sum of its digits (68) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 723235847 + ... + 723259146.

Almost surely, 2^{16851666668450} is an apocalyptic number.

16851666668450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16851666668450 is a deficient number, since it is larger than the sum of its proper divisors (14626957390978).

16851666668450 is a wasteful number, since it uses less digits than its factorization.

16851666668450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446495238 (or 1446495233 counting only the distinct ones).

The product of its (nonzero) digits is 298598400, while the sum is 68.

The spelling of 16851666668450 in words is "sixteen trillion, eight hundred fifty-one billion, six hundred sixty-six million, six hundred sixty-eight thousand, four hundred fifty".