6640703989 has 2 divisors, whose sum is σ = 6640703990. Its totient is φ = 6640703988.

The previous prime is 6640703969. The next prime is 6640704013. The reversal of 6640703989 is 9893070466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5866028100 + 774675889 = 76590^2 + 27833^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640703989 - 2¹³ = 6640695797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6640703969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320351994 + 3320351995.

It is an arithmetic number, because the mean of its divisors is an integer number (3320351995).

Almost surely, 2^6640703989 is an apocalyptic number.

It is an amenable number.

6640703989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640703989 is an equidigital number, since it uses as much as digits as its factorization.

6640703989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The square root of 6640703989 is about 81490.5147179719. The cubic root of 6640703989 is about 1879.6256977965.

The spelling of 6640703989 in words is "six billion, six hundred forty million, seven hundred three thousand, nine hundred eighty-nine".