6542651565 has 24 divisors (see below), whose sum is σ = 11343967128. Its totient is φ = 3488376960.

The previous prime is 6542651561. The next prime is 6542651623. The reversal of 6542651565 is 5651562456.

6542651565 is a `hidden beast` number, since 6 + 54 + 26 + 515 + 65 = 666.

6542651565 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 106440489 + 6436211076 = 10317^2 + 80226^2 .

It is not a de Polignac number, because 6542651565 - 2² = 6542651561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6542651565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6542651561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145695 + ... + 185235.

It is an arithmetic number, because the mean of its divisors is an integer number (472665297).

Almost surely, 2^6542651565 is an apocalyptic number.

It is an amenable number.

6542651565 is a deficient number, since it is larger than the sum of its proper divisors (4801315563).

6542651565 is a wasteful number, since it uses less digits than its factorization.

6542651565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43229 (or 43226 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The square root of 6542651565 is about 80886.6587577952. The cubic root of 6542651565 is about 1870.3286681496.

The spelling of 6542651565 in words is "six billion, five hundred forty-two million, six hundred fifty-one thousand, five hundred sixty-five".