66800180 has 12 divisors (see below), whose sum is σ = 140280420. Its totient is φ = 26720064.

The previous prime is 66800177. The next prime is 66800221. The reversal of 66800180 is 8100866.

It can be written as a sum of positive squares in 2 ways, for example, as 32741284 + 34058896 = 5722^2 + 5836^2 .

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, 1669985 + ... + 1670024.

It is an arithmetic number, because the mean of its divisors is an integer number (11690035).

Almost surely, 2^66800180 is an apocalyptic number.

It is an amenable number.

66800180 is an abundant number, since it is smaller than the sum of its proper divisors (73480240).

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

66800180 is a wasteful number, since it uses less digits than its factorization.

66800180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340018 (or 3340016 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 66800180 is about 8173.1377083712. The cubic root of 66800180 is about 405.7506375595.

The spelling of 66800180 in words is "sixty-six million, eight hundred thousand, one hundred eighty".