66180380 has 36 divisors (see below), whose sum is σ = 161671608. Its totient is φ = 22690080.

The previous prime is 66180353. The next prime is 66180391. The reversal of 66180380 is 8308166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32786 + ... + 34745.

It is an arithmetic number, because the mean of its divisors is an integer number (4490878).

Almost surely, 2^66180380 is an apocalyptic number.

It is an amenable number.

66180380 is an abundant number, since it is smaller than the sum of its proper divisors (95491228).

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

66180380 is a wasteful number, since it uses less digits than its factorization.

66180380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67554 (or 67545 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 66180380 is about 8135.1324512881. The cubic root of 66180380 is about 404.4918282201.

The spelling of 66180380 in words is "sixty-six million, one hundred eighty thousand, three hundred eighty".