65999998 has 12 divisors (see below), whose sum is σ = 102534120. Its totient is φ = 31861256.

The previous prime is 65999993. The next prime is 66000007. The reversal of 65999998 is 89999956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65999993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17938 + ... + 21301.

It is an arithmetic number, because the mean of its divisors is an integer number (8544510).

Almost surely, 2^65999998 is an apocalyptic number.

65999998 is a deficient number, since it is larger than the sum of its proper divisors (36534122).

65999998 is a wasteful number, since it uses less digits than its factorization.

65999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39299 (or 39270 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 64.

The square root of 65999998 is about 8124.0382815445. The cubic root of 65999998 is about 404.1239979802.

The spelling of 65999998 in words is "sixty-five million, nine hundred ninety-nine thousand, nine hundred ninety-eight".