66523660 has 24 divisors (see below), whose sum is σ = 159657120. Its totient is φ = 22808064.

The previous prime is 66523657. The next prime is 66523687. The reversal of 66523660 is 6632566.

66523660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237445 + ... + 237724.

It is an arithmetic number, because the mean of its divisors is an integer number (6652380).

Almost surely, 2^66523660 is an apocalyptic number.

It is an amenable number.

66523660 is an abundant number, since it is smaller than the sum of its proper divisors (93133460).

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

66523660 is a wasteful number, since it uses less digits than its factorization.

66523660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475185 (or 475183 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 66523660 is about 8156.2037738154. The cubic root of 66523660 is about 405.1899936688.

The spelling of 66523660 in words is "sixty-six million, five hundred twenty-three thousand, six hundred sixty".