66604465 has 4 divisors (see below), whose sum is σ = 79925364. Its totient is φ = 53283568.

The previous prime is 66604427. The next prime is 66604501. The reversal of 66604465 is 56440666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48762289 + 17842176 = 6983^2 + 4224^2 .

It is a cyclic number.

It is not a de Polignac number, because 66604465 - 2²⁵ = 33050033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6660442 + ... + 6660451.

It is an arithmetic number, because the mean of its divisors is an integer number (19981341).

Almost surely, 2^66604465 is an apocalyptic number.

It is an amenable number.

66604465 is a deficient number, since it is larger than the sum of its proper divisors (13320899).

66604465 is a wasteful number, since it uses less digits than its factorization.

66604465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13320898.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 66604465 is about 8161.1558617637. The cubic root of 66604465 is about 405.3539860970.

The spelling of 66604465 in words is "sixty-six million, six hundred four thousand, four hundred sixty-five".