81569134240392 has 32 divisors (see below), whose sum is σ = 204160785285600. Its totient is φ = 27157984788864.

The previous prime is 81569134240367. The next prime is 81569134240403. The reversal of 81569134240392 is 29304243196518.

81569134240392 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 1982893042 + ... + 1982934177.

It is an arithmetic number, because the mean of its divisors is an integer number (6380024540175).

Almost surely, 2^{81569134240392} is an apocalyptic number.

It is an amenable number.

81569134240392 is an abundant number, since it is smaller than the sum of its proper divisors (122591651045208).

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

81569134240392 is a wasteful number, since it uses less digits than its factorization.

81569134240392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965828085 (or 3965828081 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 81569134240392 in words is "eighty-one trillion, five hundred sixty-nine billion, one hundred thirty-four million, two hundred forty thousand, three hundred ninety-two".