6520807657 has 32 divisors (see below), whose sum is σ = 8944992000. Its totient is φ = 4600240128.

The previous prime is 6520807639. The next prime is 6520807661. The reversal of 6520807657 is 7567080256.

It is a cyclic number.

It is not a de Polignac number, because 6520807657 - 2⁷ = 6520807529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6520807697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81532 + ... + 140317.

It is an arithmetic number, because the mean of its divisors is an integer number (279531000).

Almost surely, 2^6520807657 is an apocalyptic number.

It is an amenable number.

6520807657 is a deficient number, since it is larger than the sum of its proper divisors (2424184343).

6520807657 is a wasteful number, since it uses less digits than its factorization.

6520807657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221905.

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 6520807657 is about 80751.5179857320. The cubic root of 6520807657 is about 1868.2448626652.

The spelling of 6520807657 in words is "six billion, five hundred twenty million, eight hundred seven thousand, six hundred fifty-seven".