6501140643 has 32 divisors (see below), whose sum is σ = 9320002560. Its totient is φ = 4018360320.

The previous prime is 6501140617. The next prime is 6501140651. The reversal of 6501140643 is 3460411056.

It is not a de Polignac number, because 6501140643 - 2⁹ = 6501140131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6501140643.

It is not an unprimeable number, because it can be changed into a prime (6501140683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1299555 + ... + 1304547.

It is an arithmetic number, because the mean of its divisors is an integer number (291250080).

Almost surely, 2^6501140643 is an apocalyptic number.

6501140643 is a deficient number, since it is larger than the sum of its proper divisors (2818861917).

6501140643 is a wasteful number, since it uses less digits than its factorization.

6501140643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 6501140643 is about 80629.6511402598. The cubic root of 6501140643 is about 1866.3647377345.

Adding to 6501140643 its reverse (3460411056), we get a palindrome (9961551699).

The spelling of 6501140643 in words is "six billion, five hundred one million, one hundred forty thousand, six hundred forty-three".