66650188 has 18 divisors (see below), whose sum is σ = 128206148. Its totient is φ = 30295320.

The previous prime is 66650161. The next prime is 66650189. The reversal of 66650188 is 88105666.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66650188.

It is not an unprimeable number, because it can be changed into a prime (66650189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68370 + ... + 69337.

Almost surely, 2^66650188 is an apocalyptic number.

It is an amenable number.

66650188 is a deficient number, since it is larger than the sum of its proper divisors (61555960).

66650188 is a wasteful number, since it uses less digits than its factorization.

66650188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137733 (or 137720 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 66650188 is about 8163.9566387873. The cubic root of 66650188 is about 405.4467214254.

The spelling of 66650188 in words is "sixty-six million, six hundred fifty thousand, one hundred eighty-eight".