6513020865 has 168 divisors, whose sum is σ = 12937228920. Its totient is φ = 3144241152.

The previous prime is 6513020861. The next prime is 6513020869. The reversal of 6513020865 is 5680203156.

It is an interprime number because it is at equal distance from previous prime (6513020861) and next prime (6513020869).

It can be written as a sum of positive squares in 12 ways, for example, as 3211828929 + 3301191936 = 56673^2 + 57456^2 .

It is not a de Polignac number, because 6513020865 - 2² = 6513020861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6513020861) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 59752431 + ... + 59752539.

It is an arithmetic number, because the mean of its divisors is an integer number (77007315).

Almost surely, 2^6513020865 is an apocalyptic number.

6513020865 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6513020865 is a deficient number, since it is larger than the sum of its proper divisors (6424208055).

6513020865 is a wasteful number, since it uses less digits than its factorization.

6513020865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 6513020865 is about 80703.2890593686. The cubic root of 6513020865 is about 1867.5009145009.

The spelling of 6513020865 in words is "six billion, five hundred thirteen million, twenty thousand, eight hundred sixty-five".