6520645605 has 32 divisors (see below), whose sum is σ = 10721289600. Its totient is φ = 3381702912.

The previous prime is 6520645553. The next prime is 6520645619. The reversal of 6520645605 is 5065460256.

It is a happy number.

It is not a de Polignac number, because 6520645605 - 2¹³ = 6520637413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1723606 + ... + 1727384.

It is an arithmetic number, because the mean of its divisors is an integer number (335040300).

Almost surely, 2^6520645605 is an apocalyptic number.

It is an amenable number.

6520645605 is a deficient number, since it is larger than the sum of its proper divisors (4200643995).

6520645605 is a wasteful number, since it uses less digits than its factorization.

6520645605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6933.

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 6520645605 is about 80750.5145804038. The cubic root of 6520645605 is about 1868.2293862938.

The spelling of 6520645605 in words is "six billion, five hundred twenty million, six hundred forty-five thousand, six hundred five".