81426385611 has 24 divisors (see below), whose sum is σ = 118319881680. Its totient is φ = 53959580736.

The previous prime is 81426385589. The next prime is 81426385619. The reversal of 81426385611 is 11658362418.

81426385611 is a `hidden beast` number, since 8 + 1 + 4 + 2 + 638 + 5 + 6 + 1 + 1 = 666.

It is not a de Polignac number, because 81426385611 - 2⁷ = 81426385483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81426385619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4755181 + ... + 4772273.

It is an arithmetic number, because the mean of its divisors is an integer number (4929995070).

Almost surely, 2^81426385611 is an apocalyptic number.

81426385611 is a deficient number, since it is larger than the sum of its proper divisors (36893496069).

81426385611 is a wasteful number, since it uses less digits than its factorization.

81426385611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20235 (or 20232 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 81426385611 in words is "eighty-one billion, four hundred twenty-six million, three hundred eighty-five thousand, six hundred eleven".