81748009608 has 32 divisors (see below), whose sum is σ = 210962607360. Its totient is φ = 26370325440.

The previous prime is 81748009583. The next prime is 81748009631. The reversal of 81748009608 is 80690084718.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54937435 + ... + 54938922.

It is an arithmetic number, because the mean of its divisors is an integer number (6592581480).

Almost surely, 2^81748009608 is an apocalyptic number.

It is an amenable number.

81748009608 is an abundant number, since it is smaller than the sum of its proper divisors (129214597752).

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

81748009608 is a wasteful number, since it uses less digits than its factorization.

81748009608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109876397 (or 109876393 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 51.

The spelling of 81748009608 in words is "eighty-one billion, seven hundred forty-eight million, nine thousand, six hundred eight".