81475533340 has 48 divisors (see below), whose sum is σ = 172484676000. Its totient is φ = 32326808832.

The previous prime is 81475533331. The next prime is 81475533353. The reversal of 81475533340 is 4333557418.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2183722 + ... + 2220718.

It is an arithmetic number, because the mean of its divisors is an integer number (3593430750).

Almost surely, 2^81475533340 is an apocalyptic number.

It is an amenable number.

81475533340 is an abundant number, since it is smaller than the sum of its proper divisors (91009142660).

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

81475533340 is a wasteful number, since it uses less digits than its factorization.

81475533340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37894 (or 37892 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 81475533340 in words is "eighty-one billion, four hundred seventy-five million, five hundred thirty-three thousand, three hundred forty".