66375686 has 16 divisors (see below), whose sum is σ = 108982608. Its totient is φ = 30132000.

The previous prime is 66375671. The next prime is 66375689. The reversal of 66375686 is 68657366.

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 66375686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66375689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19340 + ... + 22511.

It is an arithmetic number, because the mean of its divisors is an integer number (6811413).

Almost surely, 2^66375686 is an apocalyptic number.

66375686 is a deficient number, since it is larger than the sum of its proper divisors (42606922).

66375686 is a wasteful number, since it uses less digits than its factorization.

66375686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41927.

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

The square root of 66375686 is about 8147.1274692372. The cubic root of 66375686 is about 404.8893382562.

The spelling of 66375686 in words is "sixty-six million, three hundred seventy-five thousand, six hundred eighty-six".