51818512173 has 16 divisors (see below), whose sum is σ = 71003358720. Its totient is φ = 33590846016.

The previous prime is 51818512121. The next prime is 51818512177. The reversal of 51818512173 is 37121581815.

It is not a de Polignac number, because 51818512173 - 2²⁰ = 51817463597 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 31108 + ... + 323426.

It is an arithmetic number, because the mean of its divisors is an integer number (4437709920).

Almost surely, 2^51818512173 is an apocalyptic number.

It is an amenable number.

51818512173 is a deficient number, since it is larger than the sum of its proper divisors (19184846547).

51818512173 is a wasteful number, since it uses less digits than its factorization.

51818512173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293956.

The product of its digits is 67200, while the sum is 42.

The spelling of 51818512173 in words is "fifty-one billion, eight hundred eighteen million, five hundred twelve thousand, one hundred seventy-three".