81125980008 has 32 divisors (see below), whose sum is σ = 202845609600. Its totient is φ = 27037905408.

The previous prime is 81125979943. The next prime is 81125980009. The reversal of 81125980008 is 80008952118.

It is not an unprimeable number, because it can be changed into a prime (81125980009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91273 + ... + 413016.

It is an arithmetic number, because the mean of its divisors is an integer number (6338925300).

Almost surely, 2^81125980008 is an apocalyptic number.

It is an amenable number.

81125980008 is an abundant number, since it is smaller than the sum of its proper divisors (121719629592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81125980008 is a wasteful number, since it uses less digits than its factorization.

81125980008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511001 (or 510997 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 42.

The spelling of 81125980008 in words is "eighty-one billion, one hundred twenty-five million, nine hundred eighty thousand, eight".