51155117171 has 4 divisors (see below), whose sum is σ = 51196674144. Its totient is φ = 51113560200.

The previous prime is 51155117161. The next prime is 51155117173. The reversal of 51155117171 is 17171155115.

51155117171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51155117171 - 2⁶ = 51155117107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51155117173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20776640 + ... + 20779101.

It is an arithmetic number, because the mean of its divisors is an integer number (12799168536).

Almost surely, 2^51155117171 is an apocalyptic number.

51155117171 is a deficient number, since it is larger than the sum of its proper divisors (41556973).

51155117171 is a wasteful number, since it uses less digits than its factorization.

51155117171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41556972.

The product of its digits is 6125, while the sum is 35.

The spelling of 51155117171 in words is "fifty-one billion, one hundred fifty-five million, one hundred seventeen thousand, one hundred seventy-one".