66646065 has 48 divisors (see below), whose sum is σ = 114988608. Its totient is φ = 32934528.

The previous prime is 66646057. The next prime is 66646079. The reversal of 66646065 is 56064666.

It is not a de Polignac number, because 66646065 - 2³ = 66646057 is a prime.

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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 293482 + ... + 293708.

It is an arithmetic number, because the mean of its divisors is an integer number (2395596).

Almost surely, 2^66646065 is an apocalyptic number.

It is an amenable number.

66646065 is a deficient number, since it is larger than the sum of its proper divisors (48342543).

66646065 is a wasteful number, since it uses less digits than its factorization.

66646065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 66646065 is about 8163.7041225169. The cubic root of 66646065 is about 405.4383609023.

The spelling of 66646065 in words is "sixty-six million, six hundred forty-six thousand, sixty-five".