6668865389 has 2 divisors, whose sum is σ = 6668865390. Its totient is φ = 6668865388.

The previous prime is 6668865361. The next prime is 6668865409. The reversal of 6668865389 is 9835688666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6170102500 + 498762889 = 78550^2 + 22333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6668865389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668805389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334432694 + 3334432695.

It is an arithmetic number, because the mean of its divisors is an integer number (3334432695).

Almost surely, 2^6668865389 is an apocalyptic number.

It is an amenable number.

6668865389 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668865389 is an equidigital number, since it uses as much as digits as its factorization.

6668865389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89579520, while the sum is 65.

The square root of 6668865389 is about 81663.1213522971. The cubic root of 6668865389 is about 1882.2789427129.

The spelling of 6668865389 in words is "six billion, six hundred sixty-eight million, eight hundred sixty-five thousand, three hundred eighty-nine".