66375866 has 8 divisors (see below), whose sum is σ = 100324224. Its totient is φ = 32934460.

The previous prime is 66375863. The next prime is 66375889. The reversal of 66375866 is 66857366.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66375866.

It is not an unprimeable number, because it can be changed into a prime (66375863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126410 + ... + 126933.

It is an arithmetic number, because the mean of its divisors is an integer number (12540528).

Almost surely, 2^66375866 is an apocalyptic number.

66375866 is a deficient number, since it is larger than the sum of its proper divisors (33948358).

66375866 is a wasteful number, since it uses less digits than its factorization.

66375866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253476.

The product of its digits is 1088640, while the sum is 47.

The square root of 66375866 is about 8147.1385160681. The cubic root of 66375866 is about 404.8897042538.

The spelling of 66375866 in words is "sixty-six million, three hundred seventy-five thousand, eight hundred sixty-six".