66890198 has 16 divisors (see below), whose sum is σ = 103916736. Its totient is φ = 32270280.

The previous prime is 66890183. The next prime is 66890227. The reversal of 66890198 is 89109866.

It is a congruent number.

It is an unprimeable number.

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, 2453 + ... + 11823.

It is an arithmetic number, because the mean of its divisors is an integer number (6494796).

Almost surely, 2^66890198 is an apocalyptic number.

66890198 is a deficient number, since it is larger than the sum of its proper divisors (37026538).

66890198 is a wasteful number, since it uses less digits than its factorization.

66890198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9499.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 66890198 is about 8178.6427969438. The cubic root of 66890198 is about 405.9328150454.

The spelling of 66890198 in words is "sixty-six million, eight hundred ninety thousand, one hundred ninety-eight".