1817156117941 has 2 divisors, whose sum is σ = 1817156117942. Its totient is φ = 1817156117940.

The previous prime is 1817156117927. The next prime is 1817156117957. The reversal of 1817156117941 is 1497116517181.

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., 1259005178916 + 558150939025 = 1122054^2 + 747095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1817156117941 - 2⁹ = 1817156117429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1817156117911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908578058970 + 908578058971.

It is an arithmetic number, because the mean of its divisors is an integer number (908578058971).

Almost surely, 2^{1817156117941} is an apocalyptic number.

It is an amenable number.

1817156117941 is a deficient number, since it is larger than the sum of its proper divisors (1).

1817156117941 is an equidigital number, since it uses as much as digits as its factorization.

1817156117941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 52.

The spelling of 1817156117941 in words is "one trillion, eight hundred seventeen billion, one hundred fifty-six million, one hundred seventeen thousand, nine hundred forty-one".