81423308481 has 16 divisors (see below), whose sum is σ = 113292170880. Its totient is φ = 51918641280.

The previous prime is 81423308479. The next prime is 81423308513. The reversal of 81423308481 is 18480332418.

It is not a de Polignac number, because 81423308481 - 2¹ = 81423308479 is a prime.

It is a super-2 number, since 2×81423308481² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81423300481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1356771 + ... + 1415511.

It is an arithmetic number, because the mean of its divisors is an integer number (7080760680).

Almost surely, 2^81423308481 is an apocalyptic number.

It is an amenable number.

81423308481 is a deficient number, since it is larger than the sum of its proper divisors (31868862399).

81423308481 is a wasteful number, since it uses less digits than its factorization.

81423308481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78856.

The product of its (nonzero) digits is 147456, while the sum is 42.

The spelling of 81423308481 in words is "eighty-one billion, four hundred twenty-three million, three hundred eight thousand, four hundred eighty-one".