81050857552 has 160 divisors (see below), whose sum is σ = 199551672320. Its totient is φ = 31104622080.

The previous prime is 81050857549. The next prime is 81050857579. The reversal of 81050857552 is 25575805018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2822338 + ... + 2850910.

It is an arithmetic number, because the mean of its divisors is an integer number (1247197952).

Almost surely, 2^81050857552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81050857552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99775836160).

81050857552 is an abundant number, since it is smaller than the sum of its proper divisors (118500814768).

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

81050857552 is a wasteful number, since it uses less digits than its factorization.

81050857552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28681 (or 28675 counting only the distinct ones).

The product of its (nonzero) digits is 560000, while the sum is 46.

The spelling of 81050857552 in words is "eighty-one billion, fifty million, eight hundred fifty-seven thousand, five hundred fifty-two".