66997 has 8 divisors (see below), whose sum is σ = 81216. Its totient is φ = 53952.

The previous prime is 66977. The next prime is 67003. The reversal of 66997 is 79966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163 + ... + 400.

It is an arithmetic number, because the mean of its divisors is an integer number (10152).

2⁶⁶⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

66997 is a deficient number, since it is larger than the sum of its proper divisors (14219).

66997 is a wasteful number, since it uses less digits than its factorization.

66997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587.

The product of its digits is 20412, while the sum is 37.

The square root of 66997 is about 258.8377870405. The cubic root of 66997 is about 40.6148747942.

The spelling of 66997 in words is "sixty-six thousand, nine hundred ninety-seven".