181572222245 has 4 divisors (see below), whose sum is σ = 217886666700. Its totient is φ = 145257777792.

The previous prime is 181572222241. The next prime is 181572222259. The reversal of 181572222245 is 542222275181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51314028676 + 130258193569 = 226526^2 + 360913^2 .

It is a cyclic number.

It is not a de Polignac number, because 181572222245 - 2² = 181572222241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181572222241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18157222220 + ... + 18157222229.

It is an arithmetic number, because the mean of its divisors is an integer number (54471666675).

Almost surely, 2^181572222245 is an apocalyptic number.

It is an amenable number.

181572222245 is a deficient number, since it is larger than the sum of its proper divisors (36314444455).

181572222245 is an equidigital number, since it uses as much as digits as its factorization.

181572222245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36314444454.

The product of its digits is 179200, while the sum is 41.

The spelling of 181572222245 in words is "one hundred eighty-one billion, five hundred seventy-two million, two hundred twenty-two thousand, two hundred forty-five".