66063666 has 48 divisors (see below), whose sum is σ = 145002240. Its totient is φ = 20040960.

The previous prime is 66063661. The next prime is 66063677. The reversal of 66063666 is 66636066.

It is a super-3 number, since 3×66063666³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66063661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53140 + ... + 54368.

It is an arithmetic number, because the mean of its divisors is an integer number (3020880).

Almost surely, 2^66063666 is an apocalyptic number.

66063666 is an abundant number, since it is smaller than the sum of its proper divisors (78938574).

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

66063666 is a wasteful number, since it uses less digits than its factorization.

66063666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299 (or 1282 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 39.

The square root of 66063666 is about 8127.9558315729. The cubic root of 66063666 is about 404.2539045376.

The spelling of 66063666 in words is "sixty-six million, sixty-three thousand, six hundred sixty-six".