81547453248 has 56 divisors (see below), whose sum is σ = 222721017600. Its totient is φ = 26305628160.

The previous prime is 81547453223. The next prime is 81547453261. The reversal of 81547453248 is 84235474518.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81547453248.

It is a congruent number.

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, 6844473 + ... + 6856376.

Almost surely, 2^81547453248 is an apocalyptic number.

It is an amenable number.

81547453248 is an abundant number, since it is smaller than the sum of its proper divisors (141173564352).

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

81547453248 is a wasteful number, since it uses less digits than its factorization.

81547453248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13700895 (or 13700885 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 51.

The spelling of 81547453248 in words is "eighty-one billion, five hundred forty-seven million, four hundred fifty-three thousand, two hundred forty-eight".