66500666 has 8 divisors (see below), whose sum is σ = 99792000. Its totient is φ = 33236668.

The previous prime is 66500663. The next prime is 66500669. The reversal of 66500666 is 66600566.

It is an interprime number because it is at equal distance from previous prime (66500663) and next prime (66500669).

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

It is not an unprimeable number, because it can be changed into a prime (66500663) 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, 1085 + ... + 11583.

It is an arithmetic number, because the mean of its divisors is an integer number (12474000).

Almost surely, 2^66500666 is an apocalyptic number.

66500666 is a deficient number, since it is larger than the sum of its proper divisors (33291334).

66500666 is a wasteful number, since it uses less digits than its factorization.

66500666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13668.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 66500666 is about 8154.7940501278. The cubic root of 66500666 is about 405.1433034516.

The spelling of 66500666 in words is "sixty-six million, five hundred thousand, six hundred sixty-six".