66065603 has 4 divisors (see below), whose sum is σ = 69542760. Its totient is φ = 62588448.

The previous prime is 66065579. The next prime is 66065611. The reversal of 66065603 is 30656066.

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 66065603 - 2¹⁴ = 66049219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66065603.

It is not an unprimeable number, because it can be changed into a prime (66065203) 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, 1738550 + ... + 1738587.

It is an arithmetic number, because the mean of its divisors is an integer number (17385690).

Almost surely, 2^66065603 is an apocalyptic number.

66065603 is a deficient number, since it is larger than the sum of its proper divisors (3477157).

66065603 is a wasteful number, since it uses less digits than its factorization.

66065603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3477156.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 66065603 is about 8128.0749873509. The cubic root of 66065603 is about 404.2578554343.

The spelling of 66065603 in words is "sixty-six million, sixty-five thousand, six hundred three".