81497343132 has 24 divisors (see below), whose sum is σ = 211289408400. Its totient is φ = 27165781008.

The previous prime is 81497343127. The next prime is 81497343149. The reversal of 81497343132 is 23134379418.

81497343132 is a `hidden beast` number, since 8 + 149 + 73 + 431 + 3 + 2 = 666.

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, 377302407 + ... + 377302622.

It is an arithmetic number, because the mean of its divisors is an integer number (8803725350).

Almost surely, 2^81497343132 is an apocalyptic number.

It is an amenable number.

81497343132 is an abundant number, since it is smaller than the sum of its proper divisors (129792065268).

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

81497343132 is a wasteful number, since it uses less digits than its factorization.

81497343132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754605042 (or 754605034 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 81497343132 in words is "eighty-one billion, four hundred ninety-seven million, three hundred forty-three thousand, one hundred thirty-two".