6520807656 has 96 divisors (see below), whose sum is σ = 19279559520. Its totient is φ = 1974614400.

The previous prime is 6520807639. The next prime is 6520807661. The reversal of 6520807656 is 6567080256.

6520807656 is a `hidden beast` number, since 6 + 520 + 8 + 0 + 76 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2002926 + ... + 2006178.

It is an arithmetic number, because the mean of its divisors is an integer number (200828745).

Almost surely, 2^6520807656 is an apocalyptic number.

6520807656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6520807656 is an abundant number, since it is smaller than the sum of its proper divisors (12758751864).

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

6520807656 is a wasteful number, since it uses less digits than its factorization.

6520807656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5807 (or 5800 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 6520807656 is about 80751.5179795402. The cubic root of 6520807656 is about 1868.2448625697.

The spelling of 6520807656 in words is "six billion, five hundred twenty million, eight hundred seven thousand, six hundred fifty-six".