181374627187613 has 2 divisors, whose sum is σ = 181374627187614. Its totient is φ = 181374627187612.

The previous prime is 181374627187597. The next prime is 181374627187631. The reversal of 181374627187613 is 316781726473181.

Together with next prime (181374627187631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178514530630489 + 2860096557124 = 13360933^2 + 1691182^2 .

It is a cyclic number.

It is not a de Polignac number, because 181374627187613 - 2⁴ = 181374627187597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 181374627187613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181374627181613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90687313593806 + 90687313593807.

It is an arithmetic number, because the mean of its divisors is an integer number (90687313593807).

Almost surely, 2^{181374627187613} is an apocalyptic number.

It is an amenable number.

181374627187613 is a deficient number, since it is larger than the sum of its proper divisors (1).

181374627187613 is an equidigital number, since it uses as much as digits as its factorization.

181374627187613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56899584, while the sum is 65.

The spelling of 181374627187613 in words is "one hundred eighty-one trillion, three hundred seventy-four billion, six hundred twenty-seven million, one hundred eighty-seven thousand, six hundred thirteen".