66325666 has 24 divisors (see below), whose sum is σ = 111172572. Its totient is φ = 29647200.

The previous prime is 66325663. The next prime is 66325669. The reversal of 66325666 is 66652366.

It is an interprime number because it is at equal distance from previous prime (66325663) and next prime (66325669).

It can be written as a sum of positive squares in 2 ways, for example, as 66080641 + 245025 = 8129^2 + 495^2 .

It is not an unprimeable number, because it can be changed into a prime (66325661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12516 + ... + 17008.

Almost surely, 2^66325666 is an apocalyptic number.

66325666 is a deficient number, since it is larger than the sum of its proper divisors (44846906).

66325666 is a wasteful number, since it uses less digits than its factorization.

66325666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578 (or 4567 counting only the distinct ones).

The product of its digits is 233280, while the sum is 40.

The square root of 66325666 is about 8144.0570970494. The cubic root of 66325666 is about 404.7876059532.

The spelling of 66325666 in words is "sixty-six million, three hundred twenty-five thousand, six hundred sixty-six".