66698 has 4 divisors (see below), whose sum is σ = 100050. Its totient is φ = 33348.

The previous prime is 66697. The next prime is 66701. The reversal of 66698 is 89666.

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

It can be written as a sum of positive squares in only one way, i.e., 38809 + 27889 = 197^2 + 167^2 .

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (66697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16673 + ... + 16676.

2⁶⁶⁶⁹⁸ is an apocalyptic number.

66698 is a deficient number, since it is larger than the sum of its proper divisors (33352).

66698 is a wasteful number, since it uses less digits than its factorization.

66698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33351.

The product of its digits is 15552, while the sum is 35.

The square root of 66698 is about 258.2595593584. The cubic root of 66698 is about 40.5543648309.

The spelling of 66698 in words is "sixty-six thousand, six hundred ninety-eight".