6515645565 has 64 divisors (see below), whose sum is σ = 12642803712. Its totient is φ = 2821996800.

The previous prime is 6515645537. The next prime is 6515645659. The reversal of 6515645565 is 5655465156.

It is not a de Polignac number, because 6515645565 - 2⁶ = 6515645501 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17502 + ... + 115488.

It is an arithmetic number, because the mean of its divisors is an integer number (197543808).

Almost surely, 2^6515645565 is an apocalyptic number.

6515645565 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6515645565 is a deficient number, since it is larger than the sum of its proper divisors (6127158147).

6515645565 is a wasteful number, since it uses less digits than its factorization.

6515645565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98050.

The product of its digits is 2700000, while the sum is 48.

The square root of 6515645565 is about 80719.5488404141. The cubic root of 6515645565 is about 1867.7517439014.

The spelling of 6515645565 in words is "six billion, five hundred fifteen million, six hundred forty-five thousand, five hundred sixty-five".