65564173 has 4 divisors (see below), whose sum is σ = 65926588. Its totient is φ = 65201760.

The previous prime is 65564167. The next prime is 65564179. The reversal of 65564173 is 37146556.

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

It is an interprime number because it is at equal distance from previous prime (65564167) and next prime (65564179).

It can be written as a sum of positive squares in 2 ways, for example, as 12376324 + 53187849 = 3518^2 + 7293^2 .

It is a cyclic number.

It is not a de Polignac number, because 65564173 - 2⁵ = 65564141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65564179) 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, 180936 + ... + 181297.

It is an arithmetic number, because the mean of its divisors is an integer number (16481647).

Almost surely, 2^65564173 is an apocalyptic number.

It is an amenable number.

65564173 is a deficient number, since it is larger than the sum of its proper divisors (362415).

65564173 is a wasteful number, since it uses less digits than its factorization.

65564173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362414.

The product of its digits is 75600, while the sum is 37.

The square root of 65564173 is about 8097.1706787001. The cubic root of 65564173 is about 403.2325007297.

The spelling of 65564173 in words is "sixty-five million, five hundred sixty-four thousand, one hundred seventy-three".