18234617881 has 2 divisors, whose sum is σ = 18234617882. Its totient is φ = 18234617880.

The previous prime is 18234617837. The next prime is 18234617887. The reversal of 18234617881 is 18871643281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17704697481 + 529920400 = 133059^2 + 23020^2 .

It is a cyclic number.

It is not a de Polignac number, because 18234617881 - 2³¹ = 16087134233 is a prime.

It is a super-2 number, since 2×18234617881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18234617887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9117308940 + 9117308941.

It is an arithmetic number, because the mean of its divisors is an integer number (9117308941).

Almost surely, 2^18234617881 is an apocalyptic number.

It is an amenable number.

18234617881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18234617881 is an equidigital number, since it uses as much as digits as its factorization.

18234617881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 49.

The spelling of 18234617881 in words is "eighteen billion, two hundred thirty-four million, six hundred seventeen thousand, eight hundred eighty-one".