18150816871813 has 2 divisors, whose sum is σ = 18150816871814. Its totient is φ = 18150816871812.

The previous prime is 18150816871729. The next prime is 18150816871843. The reversal of 18150816871813 is 31817861805181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14272430184769 + 3878386687044 = 3777887^2 + 1969362^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18150816871813 is a prime.

It is a super-2 number, since 2×18150816871813² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18150816871843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9075408435906 + 9075408435907.

It is an arithmetic number, because the mean of its divisors is an integer number (9075408435907).

Almost surely, 2^{18150816871813} is an apocalyptic number.

It is an amenable number.

18150816871813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18150816871813 is an equidigital number, since it uses as much as digits as its factorization.

18150816871813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2580480, while the sum is 58.

The spelling of 18150816871813 in words is "eighteen trillion, one hundred fifty billion, eight hundred sixteen million, eight hundred seventy-one thousand, eight hundred thirteen".