81352496584 has 32 divisors (see below), whose sum is σ = 153490744440. Its totient is φ = 40422412800.

The previous prime is 81352496569. The next prime is 81352496591. The reversal of 81352496584 is 48569425318.

It can be written as a sum of positive squares in 4 ways, for example, as 64948522500 + 16403974084 = 254850^2 + 128078^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789994 + ... + 887014.

Almost surely, 2^81352496584 is an apocalyptic number.

It is an amenable number.

81352496584 is a deficient number, since it is larger than the sum of its proper divisors (72138247856).

81352496584 is a wasteful number, since it uses less digits than its factorization.

81352496584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97681 (or 97677 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 55.

The spelling of 81352496584 in words is "eighty-one billion, three hundred fifty-two million, four hundred ninety-six thousand, five hundred eighty-four".