6640628089 has 2 divisors, whose sum is σ = 6640628090. Its totient is φ = 6640628088.

The previous prime is 6640628069. The next prime is 6640628101. The reversal of 6640628089 is 9808260466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6582563689 + 58064400 = 81133^2 + 7620^2 .

It is a cyclic number.

It is not a de Polignac number, because 6640628089 - 2¹⁹ = 6640103801 is a prime.

It is not a weakly prime, because it can be changed into another prime (6640628069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320314044 + 3320314045.

It is an arithmetic number, because the mean of its divisors is an integer number (3320314045).

Almost surely, 2^6640628089 is an apocalyptic number.

It is an amenable number.

6640628089 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640628089 is an equidigital number, since it uses as much as digits as its factorization.

6640628089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 6640628089 is about 81490.0490182697. The cubic root of 6640628089 is about 1879.6185367017.

The spelling of 6640628089 in words is "six billion, six hundred forty million, six hundred twenty-eight thousand, eighty-nine".