6642621844881 has 32 divisors (see below), whose sum is σ = 9699854467968. Its totient is φ = 4010070666240.

The previous prime is 6642621844843. The next prime is 6642621844883. The reversal of 6642621844881 is 1884481262466.

It is not a de Polignac number, because 6642621844881 - 2¹⁹ = 6642621320593 is a prime.

It is a super-2 number, since 2×6642621844881² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6642621844883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19136985 + ... + 19481001.

It is an arithmetic number, because the mean of its divisors is an integer number (303120452124).

Almost surely, 2^{6642621844881} is an apocalyptic number.

It is an amenable number.

6642621844881 is a deficient number, since it is larger than the sum of its proper divisors (3057232623087).

6642621844881 is a wasteful number, since it uses less digits than its factorization.

6642621844881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346321.

The product of its digits is 28311552, while the sum is 60.

The spelling of 6642621844881 in words is "six trillion, six hundred forty-two billion, six hundred twenty-one million, eight hundred forty-four thousand, eight hundred eighty-one".