6661321426536 has 32 divisors (see below), whose sum is σ = 19032346933440. Its totient is φ = 1903234693248.

The previous prime is 6661321426477. The next prime is 6661321426541. The reversal of 6661321426536 is 6356241231666.

It is a super-2 number, since 2×6661321426536² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19825361221 + ... + 19825361556.

It is an arithmetic number, because the mean of its divisors is an integer number (594760841670).

Almost surely, 2^{6661321426536} is an apocalyptic number.

It is an amenable number.

6661321426536 is an abundant number, since it is smaller than the sum of its proper divisors (12371025506904).

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

6661321426536 is a wasteful number, since it uses less digits than its factorization.

6661321426536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39650722793 (or 39650722789 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 51.

The spelling of 6661321426536 in words is "six trillion, six hundred sixty-one billion, three hundred twenty-one million, four hundred twenty-six thousand, five hundred thirty-six".