6549991686612 has 144 divisors (see below), whose sum is σ = 19203019774848. Its totient is φ = 1862726511360.

The previous prime is 6549991686611. The next prime is 6549991686619. The reversal of 6549991686612 is 2166861999456.

6549991686612 is a `hidden beast` number, since 6 + 5 + 499 + 9 + 1 + 68 + 66 + 12 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6549991686611) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6301683 + ... + 7267130.

It is an arithmetic number, because the mean of its divisors is an integer number (133354303992).

Almost surely, 2^{6549991686612} is an apocalyptic number.

It is an amenable number.

6549991686612 is an abundant number, since it is smaller than the sum of its proper divisors (12653028088236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6549991686612 is a wasteful number, since it uses less digits than its factorization.

6549991686612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13568910 (or 13568905 counting only the distinct ones).

The product of its digits is 302330880, while the sum is 72.

The spelling of 6549991686612 in words is "six trillion, five hundred forty-nine billion, nine hundred ninety-one million, six hundred eighty-six thousand, six hundred twelve".