81126755464 has 32 divisors (see below), whose sum is σ = 152435649600. Its totient is φ = 40477326400.

The previous prime is 81126755443. The next prime is 81126755477. The reversal of 81126755464 is 46455762118.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12103314 + ... + 12110014.

It is an arithmetic number, because the mean of its divisors is an integer number (4763614050).

Almost surely, 2^81126755464 is an apocalyptic number.

It is an amenable number.

81126755464 is a deficient number, since it is larger than the sum of its proper divisors (71308894136).

81126755464 is a wasteful number, since it uses less digits than its factorization.

81126755464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9693 (or 9689 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 49.

The spelling of 81126755464 in words is "eighty-one billion, one hundred twenty-six million, seven hundred fifty-five thousand, four hundred sixty-four".