181223431866338 has 4 divisors (see below), whose sum is σ = 271835147799510. Its totient is φ = 90611715933168.

The previous prime is 181223431866307. The next prime is 181223431866439. The reversal of 181223431866338 is 833668134322181.

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

It can be written as a sum of positive squares in only one way, i.e., 118255032987169 + 62968398879169 = 10874513^2 + 7935263^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45305857966583 + ... + 45305857966586.

Almost surely, 2^{181223431866338} is an apocalyptic number.

181223431866338 is a deficient number, since it is larger than the sum of its proper divisors (90611715933172).

181223431866338 is an equidigital number, since it uses as much as digits as its factorization.

181223431866338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90611715933171.

The product of its digits is 23887872, while the sum is 59.

The spelling of 181223431866338 in words is "one hundred eighty-one trillion, two hundred twenty-three billion, four hundred thirty-one million, eight hundred sixty-six thousand, three hundred thirty-eight".