6645005501 has 2 divisors, whose sum is σ = 6645005502. Its totient is φ = 6645005500.

The previous prime is 6645005461. The next prime is 6645005519. The reversal of 6645005501 is 1055005466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4988596900 + 1656408601 = 70630^2 + 40699^2 .

It is a cyclic number.

It is not a de Polignac number, because 6645005501 - 2²² = 6640811197 is a prime.

It is a super-2 number, since 2×6645005501² = 88312196216640522002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6645005531) 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 as a sum of consecutive naturals, namely, 3322502750 + 3322502751.

It is an arithmetic number, because the mean of its divisors is an integer number (3322502751).

Almost surely, 2^6645005501 is an apocalyptic number.

It is an amenable number.

6645005501 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645005501 is an equidigital number, since it uses as much as digits as its factorization.

6645005501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 6645005501 is about 81516.9031612463. The cubic root of 6645005501 is about 1880.0314523371.

The spelling of 6645005501 in words is "six billion, six hundred forty-five million, five thousand, five hundred one".