81126632852 has 24 divisors (see below), whose sum is σ = 144106823616. Its totient is φ = 39957660288.

The previous prime is 81126632849. The next prime is 81126632897. The reversal of 81126632852 is 25823662118.

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 in 7 ways as a sum of consecutive naturals, for example, 476888 + ... + 624239.

It is an arithmetic number, because the mean of its divisors is an integer number (6004450984).

Almost surely, 2^81126632852 is an apocalyptic number.

It is an amenable number.

81126632852 is a deficient number, since it is larger than the sum of its proper divisors (62980190764).

81126632852 is a wasteful number, since it uses less digits than its factorization.

81126632852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101407 (or 1101405 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The spelling of 81126632852 in words is "eighty-one billion, one hundred twenty-six million, six hundred thirty-two thousand, eight hundred fifty-two".