81531353212288 has 64 divisors (see below), whose sum is σ = 196548797959200. Its totient is φ = 32886596247552.

The previous prime is 81531353212261. The next prime is 81531353212319. The reversal of 81531353212288 is 88221235313518.

It is a tau number, because it is divible by the number of its divisors (64).

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, 2676302823 + ... + 2676333286.

Almost surely, 2^{81531353212288} is an apocalyptic number.

It is an amenable number.

81531353212288 is an abundant number, since it is smaller than the sum of its proper divisors (115017444746912).

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

81531353212288 is a wasteful number, since it uses less digits than its factorization.

81531353212288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352636147 (or 5352636135 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 52.

The spelling of 81531353212288 in words is "eighty-one trillion, five hundred thirty-one billion, three hundred fifty-three million, two hundred twelve thousand, two hundred eighty-eight".