66508198 has 4 divisors (see below), whose sum is σ = 99762300. Its totient is φ = 33254098.

The previous prime is 66508193. The next prime is 66508201. The reversal of 66508198 is 89180566.

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 (66508193) 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 as a sum of consecutive naturals, namely, 16627048 + ... + 16627051.

It is an arithmetic number, because the mean of its divisors is an integer number (24940575).

Almost surely, 2^66508198 is an apocalyptic number.

66508198 is a deficient number, since it is larger than the sum of its proper divisors (33254102).

66508198 is a wasteful number, since it uses less digits than its factorization.

66508198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33254101.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 66508198 is about 8155.2558512900. The cubic root of 66508198 is about 405.1585986577.

The spelling of 66508198 in words is "sixty-six million, five hundred eight thousand, one hundred ninety-eight".