81838711296 has 60 divisors (see below), whose sum is σ = 236192075262. Its totient is φ = 27279568896.

The previous prime is 81838711261. The next prime is 81838711303. The reversal of 81838711296 is 69211783818.

It can be written as a sum of positive squares in only one way, i.e., 80338233600 + 1500477696 = 283440^2 + 38736^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8875461 + ... + 8884676.

Almost surely, 2^81838711296 is an apocalyptic number.

It is an amenable number.

81838711296 is an abundant number, since it is smaller than the sum of its proper divisors (154353363966).

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

81838711296 is a wasteful number, since it uses less digits than its factorization.

81838711296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17760161 (or 17760142 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 81838711296 in words is "eighty-one billion, eight hundred thirty-eight million, seven hundred eleven thousand, two hundred ninety-six".