66998 has 8 divisors (see below), whose sum is σ = 101640. Its totient is φ = 33120.

The previous prime is 66977. The next prime is 67003. The reversal of 66998 is 89966.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66998.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158 + ... + 398.

It is an arithmetic number, because the mean of its divisors is an integer number (12705).

2⁶⁶⁹⁹⁸ is an apocalyptic number.

66998 is a deficient number, since it is larger than the sum of its proper divisors (34642).

66998 is a wasteful number, since it uses less digits than its factorization.

66998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382.

The product of its digits is 23328, while the sum is 38.

The square root of 66998 is about 258.8397187450. The cubic root of 66998 is about 40.6150768663.

It can be divided in two parts, 669 and 98, that added together give a palindrome (767).

The spelling of 66998 in words is "sixty-six thousand, nine hundred ninety-eight".