65998 has 4 divisors (see below), whose sum is σ = 99000. Its totient is φ = 32998.

The previous prime is 65993. The next prime is 66029. The reversal of 65998 is 89956.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65993) 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 as a sum of consecutive naturals, namely, 16498 + ... + 16501.

It is an arithmetic number, because the mean of its divisors is an integer number (24750).

2⁶⁵⁹⁹⁸ is an apocalyptic number.

65998 is a deficient number, since it is larger than the sum of its proper divisors (33002).

65998 is a wasteful number, since it uses less digits than its factorization.

65998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33001.

The product of its digits is 19440, while the sum is 37.

The square root of 65998 is about 256.9007590491. The cubic root of 65998 is about 40.4119919960.

It can be divided in two parts, 659 and 98, that added together give a palindrome (757).

The spelling of 65998 in words is "sixty-five thousand, nine hundred ninety-eight".