51166155161 has 16 divisors (see below), whose sum is σ = 59127755328. Its totient is φ = 43758720000.

The previous prime is 51166155137. The next prime is 51166155179. The reversal of 51166155161 is 16155166115.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51166155161 - 2¹⁸ = 51165893017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51166155101) 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, 360161 + ... + 481713.

It is an arithmetic number, because the mean of its divisors is an integer number (3695484708).

Almost surely, 2^51166155161 is an apocalyptic number.

It is an amenable number.

51166155161 is a deficient number, since it is larger than the sum of its proper divisors (7961600167).

51166155161 is a wasteful number, since it uses less digits than its factorization.

51166155161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123832.

The product of its digits is 27000, while the sum is 38.

The spelling of 51166155161 in words is "fifty-one billion, one hundred sixty-six million, one hundred fifty-five thousand, one hundred sixty-one".