81333900744 has 16 divisors (see below), whose sum is σ = 203334751920. Its totient is φ = 27111300240.

The previous prime is 81333900629. The next prime is 81333900779. The reversal of 81333900744 is 44700933318.

It is a junction number, because it is equal to n+sod(n) for n = 81333900696 and 81333900705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1694456242 + ... + 1694456289.

It is an arithmetic number, because the mean of its divisors is an integer number (12708421995).

Almost surely, 2^81333900744 is an apocalyptic number.

It is an amenable number.

81333900744 is an abundant number, since it is smaller than the sum of its proper divisors (122000851176).

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

81333900744 is a wasteful number, since it uses less digits than its factorization.

81333900744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388912540 (or 3388912536 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 81333900744 in words is "eighty-one billion, three hundred thirty-three million, nine hundred thousand, seven hundred forty-four".