6661060605639 has 80 divisors (see below), whose sum is σ = 11242166639616. Its totient is φ = 3895461460800.

The previous prime is 6661060605637. The next prime is 6661060605643. The reversal of 6661060605639 is 9365060601666.

It is not a de Polignac number, because 6661060605639 - 2¹ = 6661060605637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661060605637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1853109 + ... + 4093425.

Almost surely, 2^{6661060605639} is an apocalyptic number.

6661060605639 is a deficient number, since it is larger than the sum of its proper divisors (4581106033977).

6661060605639 is a wasteful number, since it uses less digits than its factorization.

6661060605639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240458 (or 2240449 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 54.

The spelling of 6661060605639 in words is "six trillion, six hundred sixty-one billion, sixty million, six hundred five thousand, six hundred thirty-nine".