51000066 has 48 divisors (see below), whose sum is σ = 125274240. Its totient is φ = 14865120.

The previous prime is 51000049. The next prime is 51000071. The reversal of 51000066 is 66000015.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1290 + ... + 10181.

It is an arithmetic number, because the mean of its divisors is an integer number (2609880).

Almost surely, 2^51000066 is an apocalyptic number.

51000066 is an abundant number, since it is smaller than the sum of its proper divisors (74274174).

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

51000066 is a wasteful number, since it uses less digits than its factorization.

51000066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11511 (or 11508 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 51000066 is about 7141.4330494656. The cubic root of 51000066 is about 370.8431368980.

The spelling of 51000066 in words is "fifty-one million, sixty-six", and thus it is an aban number and an uban number.