66318398 has 16 divisors (see below), whose sum is σ = 104872320. Its totient is φ = 31366296.

The previous prime is 66318397. The next prime is 66318451. The reversal of 66318398 is 89381366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66318391) 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 7 ways as a sum of consecutive naturals, for example, 45761 + ... + 47187.

It is an arithmetic number, because the mean of its divisors is an integer number (6554520).

Almost surely, 2^66318398 is an apocalyptic number.

66318398 is a deficient number, since it is larger than the sum of its proper divisors (38553922).

66318398 is a wasteful number, since it uses less digits than its factorization.

66318398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671.

The product of its digits is 186624, while the sum is 44.

The square root of 66318398 is about 8143.6108698783. The cubic root of 66318398 is about 404.7728198030.

The spelling of 66318398 in words is "sixty-six million, three hundred eighteen thousand, three hundred ninety-eight".