81702594772 has 6 divisors (see below), whose sum is σ = 142979540858. Its totient is φ = 40851297384.

The previous prime is 81702594709. The next prime is 81702594781. The reversal of 81702594772 is 27749520718.

It can be written as a sum of positive squares in only one way, i.e., 54426090436 + 27276504336 = 233294^2 + 165156^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212824343 + ... + 10212824350.

Almost surely, 2^81702594772 is an apocalyptic number.

It is an amenable number.

81702594772 is a deficient number, since it is larger than the sum of its proper divisors (61276946086).

81702594772 is a wasteful number, since it uses less digits than its factorization.

81702594772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20425648697 (or 20425648695 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 52.

The spelling of 81702594772 in words is "eighty-one billion, seven hundred two million, five hundred ninety-four thousand, seven hundred seventy-two".