5206640066 has 4 divisors (see below), whose sum is σ = 7809960102. Its totient is φ = 2603320032.

The previous prime is 5206640041. The next prime is 5206640069. The reversal of 5206640066 is 6600466025.

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

It can be written as a sum of positive squares in only one way, i.e., 5008534441 + 198105625 = 70771^2 + 14075^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5206640069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1301660015 + ... + 1301660018.

Almost surely, 2^5206640066 is an apocalyptic number.

5206640066 is a deficient number, since it is larger than the sum of its proper divisors (2603320036).

5206640066 is a wasteful number, since it uses less digits than its factorization.

5206640066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603320035.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 5206640066 is about 72157.0513948568. The cubic root of 5206640066 is about 1733.2153181567.

The spelling of 5206640066 in words is "five billion, two hundred six million, six hundred forty thousand, sixty-six".