66608375 has 8 divisors (see below), whose sum is σ = 83127408. Its totient is φ = 53286600.

The previous prime is 66608369. The next prime is 66608393. The reversal of 66608375 is 57380666.

It is not a de Polignac number, because 66608375 - 2⁴ = 66608359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266309 + ... + 266558.

It is an arithmetic number, because the mean of its divisors is an integer number (10390926).

Almost surely, 2^66608375 is an apocalyptic number.

66608375 is a deficient number, since it is larger than the sum of its proper divisors (16519033).

66608375 is an equidigital number, since it uses as much as digits as its factorization.

66608375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532882 (or 532872 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 66608375 is about 8161.3954076494. The cubic root of 66608375 is about 405.3619180130.

The spelling of 66608375 in words is "sixty-six million, six hundred eight thousand, three hundred seventy-five".