81348513451344 has 60 divisors (see below), whose sum is σ = 227666337814656. Its totient is φ = 27115756159296.

The previous prime is 81348513451321. The next prime is 81348513451399. The reversal of 81348513451344 is 44315431584318.

81348513451344 is a `hidden beast` number, since 8 + 1 + 3 + 4 + 8 + 51 + 34 + 513 + 44 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5191489 + ... + 13771295.

Almost surely, 2^{81348513451344} is an apocalyptic number.

It is an amenable number.

81348513451344 is an abundant number, since it is smaller than the sum of its proper divisors (146317824363312).

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

81348513451344 is a wasteful number, since it uses less digits than its factorization.

81348513451344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8645664 (or 8645655 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 54.

The spelling of 81348513451344 in words is "eighty-one trillion, three hundred forty-eight billion, five hundred thirteen million, four hundred fifty-one thousand, three hundred forty-four".