18244702181 has 2 divisors, whose sum is σ = 18244702182. Its totient is φ = 18244702180.

The previous prime is 18244702127. The next prime is 18244702199. The reversal of 18244702181 is 18120744281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15439305025 + 2805397156 = 124255^2 + 52966^2 .

It is a cyclic number.

It is not a de Polignac number, because 18244702181 - 2²² = 18240507877 is a prime.

It is a super-2 number, since 2×18244702181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18244707181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122351090 + 9122351091.

It is an arithmetic number, because the mean of its divisors is an integer number (9122351091).

Almost surely, 2^18244702181 is an apocalyptic number.

It is an amenable number.

18244702181 is a deficient number, since it is larger than the sum of its proper divisors (1).

18244702181 is an equidigital number, since it uses as much as digits as its factorization.

18244702181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28672, while the sum is 38.

The spelling of 18244702181 in words is "eighteen billion, two hundred forty-four million, seven hundred two thousand, one hundred eighty-one".