81926662424321 has 16 divisors (see below), whose sum is σ = 96314495292288. Its totient is φ = 68703225513600.

The previous prime is 81926662424297. The next prime is 81926662424389. The reversal of 81926662424321 is 12342426662918.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81926662424321 is a prime.

It is a super-2 number, since 2×81926662424321² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81926662427321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193209461 + ... + 193633026.

It is an arithmetic number, because the mean of its divisors is an integer number (6019655955768).

Almost surely, 2^{81926662424321} is an apocalyptic number.

It is an amenable number.

81926662424321 is a deficient number, since it is larger than the sum of its proper divisors (14387832867967).

81926662424321 is a wasteful number, since it uses less digits than its factorization.

81926662424321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386843992.

The product of its digits is 11943936, while the sum is 56.

The spelling of 81926662424321 in words is "eighty-one trillion, nine hundred twenty-six billion, six hundred sixty-two million, four hundred twenty-four thousand, three hundred twenty-one".