81325288848 has 40 divisors (see below), whose sum is σ = 210116586400. Its totient is φ = 27105041664.

The previous prime is 81325288817. The next prime is 81325288861. The reversal of 81325288848 is 84888252318.

It is a happy number.

It is a super-2 number, since 2×81325288848² (a number of 23 digits) contains 22 as substring.

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, 298083 + ... + 501501.

It is an arithmetic number, because the mean of its divisors is an integer number (5252914660).

Almost surely, 2^81325288848 is an apocalyptic number.

It is an amenable number.

81325288848 is an abundant number, since it is smaller than the sum of its proper divisors (128791297552).

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

81325288848 is a wasteful number, since it uses less digits than its factorization.

81325288848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211759 (or 211753 counting only the distinct ones).

The product of its digits is 7864320, while the sum is 57.

The spelling of 81325288848 in words is "eighty-one billion, three hundred twenty-five million, two hundred eighty-eight thousand, eight hundred forty-eight".