6501666553 has 16 divisors (see below), whose sum is σ = 6751760400. Its totient is φ = 6256465920.

The previous prime is 6501666539. The next prime is 6501666593. The reversal of 6501666553 is 3556661056.

6501666553 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 8 ways, for example, as 22543504 + 6479123049 = 4748^2 + 80493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6501666553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6501666593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1020225 + ... + 1026577.

It is an arithmetic number, because the mean of its divisors is an integer number (421985025).

Almost surely, 2^6501666553 is an apocalyptic number.

It is an amenable number.

6501666553 is a deficient number, since it is larger than the sum of its proper divisors (250093847).

6501666553 is a wasteful number, since it uses less digits than its factorization.

6501666553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6732.

The product of its (nonzero) digits is 486000, while the sum is 43.

The square root of 6501666553 is about 80632.9123435338. The cubic root of 6501666553 is about 1866.4150629245.

The spelling of 6501666553 in words is "six billion, five hundred one million, six hundred sixty-six thousand, five hundred fifty-three".