5178181812 has 12 divisors (see below), whose sum is σ = 12082424256. Its totient is φ = 1726060600.

The previous prime is 5178181747. The next prime is 5178181823. The reversal of 5178181812 is 2181818715.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215757564 + ... + 215757587.

It is an arithmetic number, because the mean of its divisors is an integer number (1006868688).

Almost surely, 2^5178181812 is an apocalyptic number.

It is an amenable number.

5178181812 is an abundant number, since it is smaller than the sum of its proper divisors (6904242444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5178181812 is a wasteful number, since it uses less digits than its factorization.

5178181812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431515158 (or 431515156 counting only the distinct ones).

The product of its digits is 35840, while the sum is 42.

The square root of 5178181812 is about 71959.5845735646. The cubic root of 5178181812 is about 1730.0517667470.

The spelling of 5178181812 in words is "five billion, one hundred seventy-eight million, one hundred eighty-one thousand, eight hundred twelve".