66560380 has 12 divisors (see below), whose sum is σ = 139776840. Its totient is φ = 26624144.

The previous prime is 66560369. The next prime is 66560407. The reversal of 66560380 is 8306566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663990 + ... + 1664029.

It is an arithmetic number, because the mean of its divisors is an integer number (11648070).

Almost surely, 2^66560380 is an apocalyptic number.

It is an amenable number.

66560380 is an abundant number, since it is smaller than the sum of its proper divisors (73216460).

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

66560380 is a wasteful number, since it uses less digits than its factorization.

66560380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328028 (or 3328026 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 66560380 is about 8158.4545105063. The cubic root of 66560380 is about 405.2645327617.

The spelling of 66560380 in words is "sixty-six million, five hundred sixty thousand, three hundred eighty".