6511257065 has 8 divisors (see below), whose sum is σ = 7814585160. Its totient is φ = 5208287872.

The previous prime is 6511257029. The next prime is 6511257089. The reversal of 6511257065 is 5607521156.

It can be written as a sum of positive squares in 4 ways, for example, as 72318016 + 6438939049 = 8504^2 + 80243^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6511257065 - 2³² = 2216289769 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48050 + ... + 123819.

It is an arithmetic number, because the mean of its divisors is an integer number (976823145).

Almost surely, 2^6511257065 is an apocalyptic number.

It is an amenable number.

6511257065 is a deficient number, since it is larger than the sum of its proper divisors (1303328095).

6511257065 is a wasteful number, since it uses less digits than its factorization.

6511257065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179451.

The product of its (nonzero) digits is 63000, while the sum is 38.

The square root of 6511257065 is about 80692.3606359363. The cubic root of 6511257065 is about 1867.3323191303.

The spelling of 6511257065 in words is "six billion, five hundred eleven million, two hundred fifty-seven thousand, sixty-five".