66100180 has 12 divisors (see below), whose sum is σ = 138810420. Its totient is φ = 26440064.

The previous prime is 66100117. The next prime is 66100187. The reversal of 66100180 is 8100166.

It can be written as a sum of positive squares in 2 ways, for example, as 17156164 + 48944016 = 4142^2 + 6996^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66100187) 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, 1652485 + ... + 1652524.

It is an arithmetic number, because the mean of its divisors is an integer number (11567535).

Almost surely, 2^66100180 is an apocalyptic number.

It is an amenable number.

66100180 is an abundant number, since it is smaller than the sum of its proper divisors (72710240).

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

66100180 is a wasteful number, since it uses less digits than its factorization.

66100180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305018 (or 3305016 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 66100180 is about 8130.2017195147. The cubic root of 66100180 is about 404.3283691124.

The spelling of 66100180 in words is "sixty-six million, one hundred thousand, one hundred eighty".