81494722528 has 12 divisors (see below), whose sum is σ = 160442735040. Its totient is φ = 40747361248.

The previous prime is 81494722511. The next prime is 81494722559. The reversal of 81494722528 is 82522749418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1273355008 + ... + 1273355071.

It is an arithmetic number, because the mean of its divisors is an integer number (13370227920).

Almost surely, 2^81494722528 is an apocalyptic number.

It is an amenable number.

81494722528 is a deficient number, since it is larger than the sum of its proper divisors (78948012512).

81494722528 is a wasteful number, since it uses less digits than its factorization.

81494722528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546710089 (or 2546710081 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 52.

The spelling of 81494722528 in words is "eighty-one billion, four hundred ninety-four million, seven hundred twenty-two thousand, five hundred twenty-eight".