6606587021 has 2 divisors, whose sum is σ = 6606587022. Its totient is φ = 6606587020.

The previous prime is 6606586993. The next prime is 6606587023. The reversal of 6606587021 is 1207856066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4434094921 + 2172492100 = 66589^2 + 46610^2 .

It is a cyclic number.

It is not a de Polignac number, because 6606587021 - 2¹⁴ = 6606570637 is a prime.

Together with 6606587023, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6606587021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6606587023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3303293510 + 3303293511.

It is an arithmetic number, because the mean of its divisors is an integer number (3303293511).

Almost surely, 2^6606587021 is an apocalyptic number.

It is an amenable number.

6606587021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6606587021 is an equidigital number, since it uses as much as digits as its factorization.

6606587021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 6606587021 is about 81280.9142480570. The cubic root of 6606587021 is about 1876.4012774513.

The spelling of 6606587021 in words is "six billion, six hundred six million, five hundred eighty-seven thousand, twenty-one".