81696382620 has 24 divisors (see below), whose sum is σ = 228749871504. Its totient is φ = 21785702016.

The previous prime is 81696382619. The next prime is 81696382709. The reversal of 81696382620 is 2628369618.

It is a congruent number.

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, 680803129 + ... + 680803248.

It is an arithmetic number, because the mean of its divisors is an integer number (9531244646).

Almost surely, 2^81696382620 is an apocalyptic number.

It is an amenable number.

81696382620 is an abundant number, since it is smaller than the sum of its proper divisors (147053488884).

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

81696382620 is a wasteful number, since it uses less digits than its factorization.

81696382620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361606389 (or 1361606387 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 81696382620 in words is "eighty-one billion, six hundred ninety-six million, three hundred eighty-two thousand, six hundred twenty".