18353700181 has 2 divisors, whose sum is σ = 18353700182. Its totient is φ = 18353700180.

The previous prime is 18353700097. The next prime is 18353700229. The reversal of 18353700181 is 18100735381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13724122500 + 4629577681 = 117150^2 + 68041^2 .

It is a cyclic number.

It is not a de Polignac number, because 18353700181 - 2²⁹ = 17816829269 is a prime.

It is a super-2 number, since 2×18353700181² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18353700181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18353200181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9176850090 + 9176850091.

It is an arithmetic number, because the mean of its divisors is an integer number (9176850091).

Almost surely, 2^18353700181 is an apocalyptic number.

It is an amenable number.

18353700181 is a deficient number, since it is larger than the sum of its proper divisors (1).

18353700181 is an equidigital number, since it uses as much as digits as its factorization.

18353700181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 18353700181 in words is "eighteen billion, three hundred fifty-three million, seven hundred thousand, one hundred eighty-one".