6520006520 has 64 divisors (see below), whose sum is σ = 14907659040. Its totient is φ = 2566080000.

The previous prime is 6520006499. The next prime is 6520006531. The reversal of 6520006520 is 256000256.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6520006520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653570 + ... + 663470.

Almost surely, 2^6520006520 is an apocalyptic number.

It is an amenable number.

6520006520 is an abundant number, since it is smaller than the sum of its proper divisors (8387652520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6520006520 is a wasteful number, since it uses less digits than its factorization.

6520006520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10176 (or 10172 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 6520006520 is about 80746.5573259938. The cubic root of 6520006520 is about 1868.1683495776.

Adding to 6520006520 its reverse (256000256), we get a palindrome (6776006776).

It can be divided in two parts, 652000 and 6520, that multiplied together give a square (4251040000 = 65200²).

The spelling of 6520006520 in words is "six billion, five hundred twenty million, six thousand, five hundred twenty".