66610603 has 4 divisors (see below), whose sum is σ = 67233240. Its totient is φ = 65987968.

The previous prime is 66610589. The next prime is 66610613. The reversal of 66610603 is 30601666.

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

It is a cyclic number.

It is not a de Polignac number, because 66610603 - 2²⁵ = 33056171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66610613) 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, 311158 + ... + 311371.

It is an arithmetic number, because the mean of its divisors is an integer number (16808310).

Almost surely, 2^66610603 is an apocalyptic number.

66610603 is a deficient number, since it is larger than the sum of its proper divisors (622637).

66610603 is a wasteful number, since it uses less digits than its factorization.

66610603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622636.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 66610603 is about 8161.5319027741. The cubic root of 66610603 is about 405.3664376463.

The spelling of 66610603 in words is "sixty-six million, six hundred ten thousand, six hundred three".