66699 has 6 divisors (see below), whose sum is σ = 96356. Its totient is φ = 44460.
The previous prime is 66697. The next prime is 66701. The reversal of 66699 is 99666.
66699 is nontrivially palindromic in base 12.
It is an interprime number because it is at equal distance from previous prime (66697) and next prime (66701).
It is not a de Polignac number, because 66699 - 21 = 66697 is a prime.
It is a Duffinian number.
66699 is a lucky number.
It is a plaindrome in base 10 and base 13.
It is a zygodrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (66697) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3697 + ... + 3714.
266699 is an apocalyptic number.
66699 is a deficient number, since it is larger than the sum of its proper divisors (29657).
66699 is a wasteful number, since it uses less digits than its factorization.
66699 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7417 (or 7414 counting only the distinct ones).
The product of its digits is 17496, while the sum is 36.
The square root of 66699 is about 258.2614953879. The cubic root of 66699 is about 40.5545675065.
The spelling of 66699 in words is "sixty-six thousand, six hundred ninety-nine".
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