6659485581391 has 4 divisors (see below), whose sum is σ = 6785136252792. Its totient is φ = 6533834909992.

The previous prime is 6659485581361. The next prime is 6659485581421. The reversal of 6659485581391 is 1931855849566.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (6659485581361) and next prime (6659485581421).

It is a cyclic number.

It is not a de Polignac number, because 6659485581391 - 2⁷ = 6659485581263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6659485581391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659485581361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62825335621 + ... + 62825335726.

It is an arithmetic number, because the mean of its divisors is an integer number (1696284063198).

Almost surely, 2^{6659485581391} is an apocalyptic number.

6659485581391 is a deficient number, since it is larger than the sum of its proper divisors (125650671401).

6659485581391 is a wasteful number, since it uses less digits than its factorization.

6659485581391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125650671400.

The product of its digits is 279936000, while the sum is 70.

The spelling of 6659485581391 in words is "six trillion, six hundred fifty-nine billion, four hundred eighty-five million, five hundred eighty-one thousand, three hundred ninety-one".