181381773867 has 8 divisors (see below), whose sum is σ = 276391274496. Its totient is φ = 103646727912.

The previous prime is 181381773787. The next prime is 181381773871. The reversal of 181381773867 is 768377183181.

181381773867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 181381773867 - 2¹⁶ = 181381708331 is a prime.

It is a super-2 number, since 2×181381773867² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181381773867.

It is not an unprimeable number, because it can be changed into a prime (181381773877) 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, 4318613643 + ... + 4318613684.

It is an arithmetic number, because the mean of its divisors is an integer number (34548909312).

Almost surely, 2^181381773867 is an apocalyptic number.

181381773867 is a deficient number, since it is larger than the sum of its proper divisors (95009500629).

181381773867 is an equidigital number, since it uses as much as digits as its factorization.

181381773867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8637227337.

The product of its digits is 9483264, while the sum is 60.

The spelling of 181381773867 in words is "one hundred eighty-one billion, three hundred eighty-one million, seven hundred seventy-three thousand, eight hundred sixty-seven".