66607 has 4 divisors (see below), whose sum is σ = 68200. Its totient is φ = 65016.

The previous prime is 66601. The next prime is 66617. The reversal of 66607 is 70666.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-66607 is a prime.

It is a Duffinian number.

66607 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732 + ... + 817.

It is an arithmetic number, because the mean of its divisors is an integer number (17050).

2⁶⁶⁶⁰⁷ is an apocalyptic number.

66607 is a deficient number, since it is larger than the sum of its proper divisors (1593).

66607 is a wasteful number, since it uses less digits than its factorization.

66607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 66607 is about 258.0833198795. The cubic root of 66607 is about 40.5359128692.

The spelling of 66607 in words is "sixty-six thousand, six hundred seven".