66610066 has 8 divisors (see below), whose sum is σ = 99950220. Its totient is φ = 33293328.

The previous prime is 66610043. The next prime is 66610069. The reversal of 66610066 is 66001666.

It can be written as a sum of positive squares in 2 ways, for example, as 66015625 + 594441 = 8125^2 + 771^2 .

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 (66610069) 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, 6340 + ... + 13168.

Almost surely, 2^66610066 is an apocalyptic number.

66610066 is a deficient number, since it is larger than the sum of its proper divisors (33340154).

66610066 is a wasteful number, since it uses less digits than its factorization.

66610066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11708.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66610066 is about 8161.4990044722. The cubic root of 66610066 is about 405.3653483184.

Subtracting from 66610066 its reverse (66001666), we obtain a square (608400 = 780²).

The spelling of 66610066 in words is "sixty-six million, six hundred ten thousand, sixty-six".