81227758708 has 12 divisors (see below), whose sum is σ = 142862893600. Its totient is φ = 40409789112.

The previous prime is 81227758687. The next prime is 81227758721. The reversal of 81227758708 is 80785772218.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 51021666 + ... + 51023257.

Almost surely, 2^81227758708 is an apocalyptic number.

It is an amenable number.

81227758708 is a deficient number, since it is larger than the sum of its proper divisors (61635134892).

81227758708 is a wasteful number, since it uses less digits than its factorization.

81227758708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102045126 (or 102045124 counting only the distinct ones).

The product of its (nonzero) digits is 3512320, while the sum is 55.

The spelling of 81227758708 in words is "eighty-one billion, two hundred twenty-seven million, seven hundred fifty-eight thousand, seven hundred eight".