66364205 has 4 divisors (see below), whose sum is σ = 79637052. Its totient is φ = 53091360.

The previous prime is 66364159. The next prime is 66364213. The reversal of 66364205 is 50246366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50246366 = 2 ⋅25123183.

It can be written as a sum of positive squares in 2 ways, for example, as 24542116 + 41822089 = 4954^2 + 6467^2 .

It is not a de Polignac number, because 66364205 - 2⁸ = 66363949 is a prime.

It is a Duffinian number.

It is a congruent 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, 6636416 + ... + 6636425.

It is an arithmetic number, because the mean of its divisors is an integer number (19909263).

Almost surely, 2^66364205 is an apocalyptic number.

It is an amenable number.

66364205 is a deficient number, since it is larger than the sum of its proper divisors (13272847).

66364205 is a wasteful number, since it uses less digits than its factorization.

66364205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13272846.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 66364205 is about 8146.4228345943. The cubic root of 66364205 is about 404.8659923454.

The spelling of 66364205 in words is "sixty-six million, three hundred sixty-four thousand, two hundred five".