66610325 has 12 divisors (see below), whose sum is σ = 82719780. Its totient is φ = 53208960.

The previous prime is 66610321. The next prime is 66610331. The reversal of 66610325 is 52301666.

It can be written as a sum of positive squares in 6 ways, for example, as 253009 + 66357316 = 503^2 + 8146^2 .

It is not a de Polignac number, because 66610325 - 2² = 66610321 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66610321) 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, 19871 + ... + 22979.

It is an arithmetic number, because the mean of its divisors is an integer number (6893315).

Almost surely, 2^66610325 is an apocalyptic number.

It is an amenable number.

66610325 is a deficient number, since it is larger than the sum of its proper divisors (16109455).

66610325 is a wasteful number, since it uses less digits than its factorization.

66610325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976 (or 3971 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66610325 is about 8161.5148716399. The cubic root of 66610325 is about 405.3658737119.

The spelling of 66610325 in words is "sixty-six million, six hundred ten thousand, three hundred twenty-five".