6600641989 has 2 divisors, whose sum is σ = 6600641990. Its totient is φ = 6600641988.

The previous prime is 6600641963. The next prime is 6600642007. The reversal of 6600641989 is 9891460066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6554197764 + 46444225 = 80958^2 + 6815^2 .

It is a cyclic number.

It is not a de Polignac number, because 6600641989 - 2¹³ = 6600633797 is a prime.

It is a super-2 number, since 2×6600641989² = 87136949333899752242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6600641939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300320994 + 3300320995.

It is an arithmetic number, because the mean of its divisors is an integer number (3300320995).

Almost surely, 2^6600641989 is an apocalyptic number.

It is an amenable number.

6600641989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6600641989 is an equidigital number, since it uses as much as digits as its factorization.

6600641989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 6600641989 is about 81244.3351194408. The cubic root of 6600641989 is about 1875.8382730159.

The spelling of 6600641989 in words is "six billion, six hundred million, six hundred forty-one thousand, nine hundred eighty-nine".