18150816871729 has 2 divisors, whose sum is σ = 18150816871730. Its totient is φ = 18150816871728.

The previous prime is 18150816871727. The next prime is 18150816871813. The reversal of 18150816871729 is 92717861805181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14253252521104 + 3897564350625 = 3775348^2 + 1974225^2 .

It is a cyclic number.

It is not a de Polignac number, because 18150816871729 - 2¹ = 18150816871727 is a prime.

It is a super-2 number, since 2×18150816871729² (a number of 27 digits) contains 22 as substring.

Together with 18150816871727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18150816871723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9075408435864 + 9075408435865.

It is an arithmetic number, because the mean of its divisors is an integer number (9075408435865).

Almost surely, 2^{18150816871729} is an apocalyptic number.

It is an amenable number.

18150816871729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18150816871729 is an equidigital number, since it uses as much as digits as its factorization.

18150816871729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 64.

The spelling of 18150816871729 in words is "eighteen trillion, one hundred fifty billion, eight hundred sixteen million, eight hundred seventy-one thousand, seven hundred twenty-nine".