81208884452 has 12 divisors (see below), whose sum is σ = 142163923440. Its totient is φ = 40590620616.

The previous prime is 81208884443. The next prime is 81208884473. The reversal of 81208884452 is 25448880218.

It is a self number, because there is not a number n which added to its sum of digits gives 81208884452.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3442178 + ... + 3465689.

It is an arithmetic number, because the mean of its divisors is an integer number (11846993620).

Almost surely, 2^81208884452 is an apocalyptic number.

It is an amenable number.

81208884452 is a deficient number, since it is larger than the sum of its proper divisors (60955038988).

81208884452 is a wasteful number, since it uses less digits than its factorization.

81208884452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6910810 (or 6910808 counting only the distinct ones).

The product of its (nonzero) digits is 1310720, while the sum is 50.

The spelling of 81208884452 in words is "eighty-one billion, two hundred eight million, eight hundred eighty-four thousand, four hundred fifty-two".