6656565501 has 10 divisors (see below), whose sum is σ = 9943758462. Its totient is φ = 4437710280.

The previous prime is 6656565463. The next prime is 6656565511. The reversal of 6656565501 is 1055656566.

It can be written as a sum of positive squares in only one way, i.e., 6222843225 + 433722276 = 78885^2 + 20826^2 .

It is not a de Polignac number, because 6656565501 - 2¹⁹ = 6656041213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656565511) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 41089830 + ... + 41089991.

Almost surely, 2^6656565501 is an apocalyptic number.

It is an amenable number.

6656565501 is a deficient number, since it is larger than the sum of its proper divisors (3287192961).

6656565501 is an equidigital number, since it uses as much as digits as its factorization.

6656565501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82179833 (or 82179824 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The square root of 6656565501 is about 81587.7778898286. Note that the first 3 decimals coincide. The cubic root of 6656565501 is about 1881.1210211887.

The spelling of 6656565501 in words is "six billion, six hundred fifty-six million, five hundred sixty-five thousand, five hundred one".