66180860 has 24 divisors (see below), whose sum is σ = 139161120. Its totient is φ = 26437824.

The previous prime is 66180853. The next prime is 66180887. The reversal of 66180860 is 6808166.

It is a self number, because there is not a number n which added to its sum of digits gives 66180860.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18281 + ... + 21599.

It is an arithmetic number, because the mean of its divisors is an integer number (5798380).

Almost surely, 2^66180860 is an apocalyptic number.

It is an amenable number.

66180860 is an abundant number, since it is smaller than the sum of its proper divisors (72980260).

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

66180860 is a wasteful number, since it uses less digits than its factorization.

66180860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325 (or 4323 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 66180860 is about 8135.1619529054. The cubic root of 66180860 is about 404.4928061313.

The spelling of 66180860 in words is "sixty-six million, one hundred eighty thousand, eight hundred sixty".