6639493587 has 8 divisors (see below), whose sum is σ = 9041012736. Its totient is φ = 4332151752.

The previous prime is 6639493517. The next prime is 6639493621. The reversal of 6639493587 is 7853949366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6639493587 - 2¹¹ = 6639491539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6639493587.

It is not an unprimeable number, because it can be changed into a prime (6639493517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23544163 + ... + 23544444.

It is an arithmetic number, because the mean of its divisors is an integer number (1130126592).

Almost surely, 2^6639493587 is an apocalyptic number.

6639493587 is a deficient number, since it is larger than the sum of its proper divisors (2401519149).

6639493587 is a wasteful number, since it uses less digits than its factorization.

6639493587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47088657.

The product of its digits is 29393280, while the sum is 60.

The square root of 6639493587 is about 81483.0877360450. The cubic root of 6639493587 is about 1879.5114909821.

The spelling of 6639493587 in words is "six billion, six hundred thirty-nine million, four hundred ninety-three thousand, five hundred eighty-seven".