66680066 has 4 divisors (see below), whose sum is σ = 100020102. Its totient is φ = 33340032.

The previous prime is 66680041. The next prime is 66680071. The reversal of 66680066 is 66008666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 1635841 = 8065^2 + 1279^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16670015 + ... + 16670018.

Almost surely, 2^66680066 is an apocalyptic number.

66680066 is a deficient number, since it is larger than the sum of its proper divisors (33340036).

66680066 is a wasteful number, since it uses less digits than its factorization.

66680066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33340035.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 66680066 is about 8165.7863062904. The cubic root of 66680066 is about 405.5072970357.

The spelling of 66680066 in words is "sixty-six million, six hundred eighty thousand, sixty-six".