81523442982 has 48 divisors (see below), whose sum is σ = 173339475120. Its totient is φ = 25560602688.

The previous prime is 81523442971. The next prime is 81523443047. The reversal of 81523442982 is 28924432518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49021083 + ... + 49022745.

It is an arithmetic number, because the mean of its divisors is an integer number (3611239065).

Almost surely, 2^81523442982 is an apocalyptic number.

81523442982 is an abundant number, since it is smaller than the sum of its proper divisors (91816032138).

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

81523442982 is an frugal number, since it uses more digits than its factorization.

81523442982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3382 (or 1685 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 48.

The spelling of 81523442982 in words is "eighty-one billion, five hundred twenty-three million, four hundred forty-two thousand, nine hundred eighty-two".