66598 has 16 divisors (see below), whose sum is σ = 117504. Its totient is φ = 27720.

The previous prime is 66593. The next prime is 66601. The reversal of 66598 is 89566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66593) by changing a digit.

66598 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 7 ways as a sum of consecutive naturals, for example, 903 + ... + 973.

It is an arithmetic number, because the mean of its divisors is an integer number (7344).

2⁶⁶⁵⁹⁸ is an apocalyptic number.

66598 is a deficient number, since it is larger than the sum of its proper divisors (50906).

66598 is a wasteful number, since it uses less digits than its factorization.

66598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147.

The product of its digits is 12960, while the sum is 34.

The square root of 66598 is about 258.0658830609. The cubic root of 66598 is about 40.5340870368.

Subtracting from 66598 its sum of digits (34), we obtain a square (66564 = 258²).

The spelling of 66598 in words is "sixty-six thousand, five hundred ninety-eight".