51001666161 has 16 divisors (see below), whose sum is σ = 71635660800. Its totient is φ = 32187109968.

The previous prime is 51001666127. The next prime is 51001666213. The reversal of 51001666161 is 16166610015.

It is not a de Polignac number, because 51001666161 - 2¹⁷ = 51001535089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51001666361) 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, 264001 + ... + 414366.

It is an arithmetic number, because the mean of its divisors is an integer number (4477228800).

Almost surely, 2^51001666161 is an apocalyptic number.

It is an amenable number.

51001666161 is a deficient number, since it is larger than the sum of its proper divisors (20633994639).

51001666161 is a wasteful number, since it uses less digits than its factorization.

51001666161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679708.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 51001666161 in words is "fifty-one billion, one million, six hundred sixty-six thousand, one hundred sixty-one".