851666651010161 has 16 divisors (see below), whose sum is σ = 973658849623680. Its totient is φ = 729755841991680.

The previous prime is 851666651010103. The next prime is 851666651010199. The reversal of 851666651010161 is 161010156666158.

It is a de Polignac number, because none of the positive numbers 2^k-851666651010161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (851666651010061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107043921 + ... + 2107448081.

It is an arithmetic number, because the mean of its divisors is an integer number (60853678101480).

Almost surely, 2^{851666651010161} is an apocalyptic number.

It is an amenable number.

851666651010161 is a deficient number, since it is larger than the sum of its proper divisors (121992198613519).

851666651010161 is a wasteful number, since it uses less digits than its factorization.

851666651010161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504104.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The spelling of 851666651010161 in words is "eight hundred fifty-one trillion, six hundred sixty-six billion, six hundred fifty-one million, ten thousand, one hundred sixty-one".