66575198 has 4 divisors (see below), whose sum is σ = 99862800. Its totient is φ = 33287598.

The previous prime is 66575191. The next prime is 66575203. The reversal of 66575198 is 89157566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89157566 = 2 ⋅44578783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66575191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16643798 + ... + 16643801.

It is an arithmetic number, because the mean of its divisors is an integer number (24965700).

Almost surely, 2^66575198 is an apocalyptic number.

66575198 is a deficient number, since it is larger than the sum of its proper divisors (33287602).

66575198 is a wasteful number, since it uses less digits than its factorization.

66575198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33287601.

The product of its digits is 453600, while the sum is 47.

The square root of 66575198 is about 8159.3625976543. The cubic root of 66575198 is about 405.2946045265.

The spelling of 66575198 in words is "sixty-six million, five hundred seventy-five thousand, one hundred ninety-eight".