81125919338 has 16 divisors (see below), whose sum is σ = 123760928160. Its totient is φ = 39872382576.

The previous prime is 81125919323. The next prime is 81125919349. The reversal of 81125919338 is 83391952118.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2688020 + ... + 2718032.

It is an arithmetic number, because the mean of its divisors is an integer number (7735058010).

Almost surely, 2^81125919338 is an apocalyptic number.

81125919338 is a deficient number, since it is larger than the sum of its proper divisors (42635008822).

81125919338 is a wasteful number, since it uses less digits than its factorization.

81125919338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52981.

The product of its digits is 466560, while the sum is 50.

The spelling of 81125919338 in words is "eighty-one billion, one hundred twenty-five million, nine hundred nineteen thousand, three hundred thirty-eight".