81429608756 has 24 divisors (see below), whose sum is σ = 149068430784. Its totient is φ = 38847459200.

The previous prime is 81429608717. The next prime is 81429608809. The reversal of 81429608756 is 65780692418.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 1066730 + ... + 1140513.

It is an arithmetic number, because the mean of its divisors is an integer number (6211184616).

Almost surely, 2^81429608756 is an apocalyptic number.

It is an amenable number.

81429608756 is a deficient number, since it is larger than the sum of its proper divisors (67638822028).

81429608756 is a wasteful number, since it uses less digits than its factorization.

81429608756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207671 (or 2207669 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 81429608756 in words is "eighty-one billion, four hundred twenty-nine million, six hundred eight thousand, seven hundred fifty-six".