81375622168892 has 48 divisors (see below), whose sum is σ = 148272487394304. Its totient is φ = 39049700400000.

The previous prime is 81375622168861. The next prime is 81375622168993. The reversal of 81375622168892 is 29886122657318.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13400984 + ... + 18502367.

It is an arithmetic number, because the mean of its divisors is an integer number (3089010154048).

Almost surely, 2^{81375622168892} is an apocalyptic number.

81375622168892 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

81375622168892 is a deficient number, since it is larger than the sum of its proper divisors (66896865225412).

81375622168892 is a wasteful number, since it uses less digits than its factorization.

81375622168892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31903650 (or 31903648 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 68.

The spelling of 81375622168892 in words is "eighty-one trillion, three hundred seventy-five billion, six hundred twenty-two million, one hundred sixty-eight thousand, eight hundred ninety-two".