81597302982 has 36 divisors (see below), whose sum is σ = 191439833364. Its totient is φ = 25106861520.

The previous prime is 81597302903. The next prime is 81597303017. The reversal of 81597302982 is 28920379518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13408744 + ... + 13414827.

It is an arithmetic number, because the mean of its divisors is an integer number (5317773149).

Almost surely, 2^81597302982 is an apocalyptic number.

81597302982 is an abundant number, since it is smaller than the sum of its proper divisors (109842530382).

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

81597302982 is a wasteful number, since it uses less digits than its factorization.

81597302982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26823605 (or 26823589 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 81597302982 in words is "eighty-one billion, five hundred ninety-seven million, three hundred two thousand, nine hundred eighty-two".