81571363296 has 48 divisors (see below), whose sum is σ = 226720411344. Its totient is φ = 25591015424.

The previous prime is 81571363283. The next prime is 81571363319. The reversal of 81571363296 is 69236317518.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24989595 + ... + 24992858.

It is an arithmetic number, because the mean of its divisors is an integer number (4723341903).

Almost surely, 2^81571363296 is an apocalyptic number.

It is an amenable number.

81571363296 is an abundant number, since it is smaller than the sum of its proper divisors (145149048048).

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

81571363296 is a wasteful number, since it uses less digits than its factorization.

81571363296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49982483 (or 49982475 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The spelling of 81571363296 in words is "eighty-one billion, five hundred seventy-one million, three hundred sixty-three thousand, two hundred ninety-six".