6666598489 has 4 divisors (see below), whose sum is σ = 6741504180. Its totient is φ = 6591692800.

The previous prime is 6666598447. The next prime is 6666598559. The reversal of 6666598489 is 9848956666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1526855625 + 5139742864 = 39075^2 + 71692^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666598489 - 2¹¹ = 6666596441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666598409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37452712 + ... + 37452889.

It is an arithmetic number, because the mean of its divisors is an integer number (1685376045).

Almost surely, 2^6666598489 is an apocalyptic number.

It is an amenable number.

6666598489 is a deficient number, since it is larger than the sum of its proper divisors (74905691).

6666598489 is an equidigital number, since it uses as much as digits as its factorization.

6666598489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74905690.

The product of its digits is 134369280, while the sum is 67.

The square root of 6666598489 is about 81649.2405904672. The cubic root of 6666598489 is about 1882.0656419761.

The spelling of 6666598489 in words is "six billion, six hundred sixty-six million, five hundred ninety-eight thousand, four hundred eighty-nine".