81167176050 has 24 divisors (see below), whose sum is σ = 201294596976. Its totient is φ = 21644580240.

The previous prime is 81167176033. The next prime is 81167176081. The reversal of 81167176050 is 5067176118.

It is a happy number.

It is a super-2 number, since 2×81167176050² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81167175993 and 81167176011.

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 11 ways as a sum of consecutive naturals, for example, 270557104 + ... + 270557403.

It is an arithmetic number, because the mean of its divisors is an integer number (8387274874).

Almost surely, 2^81167176050 is an apocalyptic number.

81167176050 is an abundant number, since it is smaller than the sum of its proper divisors (120127420926).

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

81167176050 is a wasteful number, since it uses less digits than its factorization.

81167176050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541114522 (or 541114517 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 42.

The spelling of 81167176050 in words is "eighty-one billion, one hundred sixty-seven million, one hundred seventy-six thousand, fifty".