6700664989 has 2 divisors, whose sum is σ = 6700664990. Its totient is φ = 6700664988.

The previous prime is 6700664969. The next prime is 6700665029. The reversal of 6700664989 is 9894660076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5946723225 + 753941764 = 77115^2 + 27458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6700664989 is a prime.

It is a super-2 number, since 2×6700664989² = 89797822589620740242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6700664909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3350332494 + 3350332495.

It is an arithmetic number, because the mean of its divisors is an integer number (3350332495).

Almost surely, 2^6700664989 is an apocalyptic number.

It is an amenable number.

6700664989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6700664989 is an equidigital number, since it uses as much as digits as its factorization.

6700664989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The square root of 6700664989 is about 81857.5896847690. The cubic root of 6700664989 is about 1885.2659990908.

The spelling of 6700664989 in words is "six billion, seven hundred million, six hundred sixty-four thousand, nine hundred eighty-nine".