81522237840744 has 32 divisors (see below), whose sum is σ = 204983661633120. Its totient is φ = 27017003676096.

The previous prime is 81522237840731. The next prime is 81522237840779. The reversal of 81522237840744 is 44704873222518.

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, 9817221022 + ... + 9817229325.

It is an arithmetic number, because the mean of its divisors is an integer number (6405739426035).

Almost surely, 2^{81522237840744} is an apocalyptic number.

It is an amenable number.

81522237840744 is an abundant number, since it is smaller than the sum of its proper divisors (123461423792376).

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

81522237840744 is a wasteful number, since it uses less digits than its factorization.

81522237840744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19634450529 (or 19634450525 counting only the distinct ones).

The product of its (nonzero) digits is 24084480, while the sum is 57.

The spelling of 81522237840744 in words is "eighty-one trillion, five hundred twenty-two billion, two hundred thirty-seven million, eight hundred forty thousand, seven hundred forty-four".