81708433340 has 48 divisors (see below), whose sum is σ = 188471646720. Its totient is φ = 29616966720.

The previous prime is 81708433319. The next prime is 81708433399. The reversal of 81708433340 is 4333480718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4665656 + ... + 4683135.

It is an arithmetic number, because the mean of its divisors is an integer number (3926492640).

Almost surely, 2^81708433340 is an apocalyptic number.

It is an amenable number.

81708433340 is an abundant number, since it is smaller than the sum of its proper divisors (106763213380).

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

81708433340 is a wasteful number, since it uses less digits than its factorization.

81708433340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9348842 (or 9348840 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 81708433340 in words is "eighty-one billion, seven hundred eight million, four hundred thirty-three thousand, three hundred forty".