1018158459221 has 2 divisors, whose sum is σ = 1018158459222. Its totient is φ = 1018158459220.

The previous prime is 1018158459193. The next prime is 1018158459257. The reversal of 1018158459221 is 1229548518101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1005786346321 + 12372112900 = 1002889^2 + 111230^2 .

It is an emirp because it is prime and its reverse (1229548518101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1018158459221 - 2³⁴ = 1000978590037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1018158419221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509079229610 + 509079229611.

It is an arithmetic number, because the mean of its divisors is an integer number (509079229611).

Almost surely, 2^{1018158459221} is an apocalyptic number.

It is an amenable number.

1018158459221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018158459221 is an equidigital number, since it uses as much as digits as its factorization.

1018158459221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 47.

The spelling of 1018158459221 in words is "one trillion, eighteen billion, one hundred fifty-eight million, four hundred fifty-nine thousand, two hundred twenty-one".