6689401889 has 2 divisors, whose sum is σ = 6689401890. Its totient is φ = 6689401888.

The previous prime is 6689401819. The next prime is 6689401897. The reversal of 6689401889 is 9881049866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6610990864 + 78411025 = 81308^2 + 8855^2 .

It is a cyclic number.

It is not a de Polignac number, because 6689401889 - 2³² = 2394434593 is a prime.

It is not a weakly prime, because it can be changed into another prime (6689401819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344700944 + 3344700945.

It is an arithmetic number, because the mean of its divisors is an integer number (3344700945).

Almost surely, 2^6689401889 is an apocalyptic number.

It is an amenable number.

6689401889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6689401889 is an equidigital number, since it uses as much as digits as its factorization.

6689401889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5971968, while the sum is 59.

The square root of 6689401889 is about 81788.7638309811. The cubic root of 6689401889 is about 1884.2090966313.

The spelling of 6689401889 in words is "six billion, six hundred eighty-nine million, four hundred one thousand, eight hundred eighty-nine".