81748084812 has 48 divisors (see below), whose sum is σ = 191403055200. Its totient is φ = 27155566080.

The previous prime is 81748084777. The next prime is 81748084849. The reversal of 81748084812 is 21848084718.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5238862 + ... + 5254442.

It is an arithmetic number, because the mean of its divisors is an integer number (3987563650).

Almost surely, 2^81748084812 is an apocalyptic number.

It is an amenable number.

81748084812 is an abundant number, since it is smaller than the sum of its proper divisors (109654970388).

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

81748084812 is a wasteful number, since it uses less digits than its factorization.

81748084812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17066 (or 17064 counting only the distinct ones).

The product of its (nonzero) digits is 917504, while the sum is 51.

The spelling of 81748084812 in words is "eighty-one billion, seven hundred forty-eight million, eighty-four thousand, eight hundred twelve".