66679198 has 4 divisors (see below), whose sum is σ = 100018800. Its totient is φ = 33339598.

The previous prime is 66679177. The next prime is 66679199. The reversal of 66679198 is 89197666.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×66679198² = 8892230891846408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66679199) 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, 16669798 + ... + 16669801.

It is an arithmetic number, because the mean of its divisors is an integer number (25004700).

Almost surely, 2^66679198 is an apocalyptic number.

66679198 is a deficient number, since it is larger than the sum of its proper divisors (33339602).

66679198 is a wasteful number, since it uses less digits than its factorization.

66679198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33339601.

The product of its digits is 979776, while the sum is 52.

The square root of 66679198 is about 8165.7331575309. The cubic root of 66679198 is about 405.5055374801.

The spelling of 66679198 in words is "sixty-six million, six hundred seventy-nine thousand, one hundred ninety-eight".