6521360865 has 32 divisors (see below), whose sum is σ = 10718649216. Its totient is φ = 3383869440.

The previous prime is 6521360789. The next prime is 6521360921. The reversal of 6521360865 is 5680631256.

It is a happy number.

It is not a de Polignac number, because 6521360865 - 2¹² = 6521356769 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146095 + ... + 185435.

It is an arithmetic number, because the mean of its divisors is an integer number (334957788).

Almost surely, 2^6521360865 is an apocalyptic number.

It is an amenable number.

6521360865 is a deficient number, since it is larger than the sum of its proper divisors (4197288351).

6521360865 is a wasteful number, since it uses less digits than its factorization.

6521360865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39649.

The product of its (nonzero) digits is 259200, while the sum is 42.

The square root of 6521360865 is about 80754.9432852256. The cubic root of 6521360865 is about 1868.2976934817.

The spelling of 6521360865 in words is "six billion, five hundred twenty-one million, three hundred sixty thousand, eight hundred sixty-five".