81825168935 has 8 divisors (see below), whose sum is σ = 99107868816. Its totient is φ = 64848357760.

The previous prime is 81825168913. The next prime is 81825168937. The reversal of 81825168935 is 53986152818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81825168935 - 2⁸ = 81825168679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81825168937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76471586 + ... + 76472655.

It is an arithmetic number, because the mean of its divisors is an integer number (12388483602).

Almost surely, 2^81825168935 is an apocalyptic number.

81825168935 is a deficient number, since it is larger than the sum of its proper divisors (17282699881).

81825168935 is a wasteful number, since it uses less digits than its factorization.

81825168935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152944353.

The product of its digits is 4147200, while the sum is 56.

The spelling of 81825168935 in words is "eighty-one billion, eight hundred twenty-five million, one hundred sixty-eight thousand, nine hundred thirty-five".