51181865146 has 8 divisors (see below), whose sum is σ = 76824993024. Its totient is φ = 25573534140.

The previous prime is 51181865143. The next prime is 51181865149. The reversal of 51181865146 is 64156818115.

It is an interprime number because it is at equal distance from previous prime (51181865143) and next prime (51181865149).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 51181865096 and 51181865105.

It is not an unprimeable number, because it can be changed into a prime (51181865143) 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, 8695540 + ... + 8701423.

It is an arithmetic number, because the mean of its divisors is an integer number (9603124128).

Almost surely, 2^51181865146 is an apocalyptic number.

51181865146 is a deficient number, since it is larger than the sum of its proper divisors (25643127878).

51181865146 is a wasteful number, since it uses less digits than its factorization.

51181865146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17398436.

The product of its digits is 230400, while the sum is 46.

The spelling of 51181865146 in words is "fifty-one billion, one hundred eighty-one million, eight hundred sixty-five thousand, one hundred forty-six".