51818512171 has 4 divisors (see below), whose sum is σ = 51819990192. Its totient is φ = 51817034152.

The previous prime is 51818512121. The next prime is 51818512177. The reversal of 51818512171 is 17121581815.

It is a happy number.

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 51818512171 - 2⁷ = 51818512043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51818512177) 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, 685111 + ... + 756976.

It is an arithmetic number, because the mean of its divisors is an integer number (12954997548).

Almost surely, 2^51818512171 is an apocalyptic number.

51818512171 is a deficient number, since it is larger than the sum of its proper divisors (1478021).

51818512171 is a wasteful number, since it uses less digits than its factorization.

51818512171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478020.

The product of its digits is 22400, while the sum is 40.

The spelling of 51818512171 in words is "fifty-one billion, eight hundred eighteen million, five hundred twelve thousand, one hundred seventy-one".