81936766125 has 96 divisors (see below), whose sum is σ = 156859148160. Its totient is φ = 41032051200.

The previous prime is 81936766111. The next prime is 81936766157. The reversal of 81936766125 is 52166763918.

81936766125 is a `hidden beast` number, since 8 + 19 + 3 + 6 + 7 + 6 + 612 + 5 = 666.

It is not a de Polignac number, because 81936766125 - 2⁹ = 81936765613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2398414 + ... + 2432336.

It is an arithmetic number, because the mean of its divisors is an integer number (1633949460).

Almost surely, 2^81936766125 is an apocalyptic number.

It is an amenable number.

81936766125 is a deficient number, since it is larger than the sum of its proper divisors (74922382035).

81936766125 is a wasteful number, since it uses less digits than its factorization.

81936766125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34076 (or 34063 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 81936766125 in words is "eighty-one billion, nine hundred thirty-six million, seven hundred sixty-six thousand, one hundred twenty-five".