18490600181 has 2 divisors, whose sum is σ = 18490600182. Its totient is φ = 18490600180.

The previous prime is 18490600159. The next prime is 18490600199. The reversal of 18490600181 is 18100609481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11075668081 + 7414932100 = 105241^2 + 86110^2 .

It is a cyclic number.

It is not a de Polignac number, because 18490600181 - 2¹⁰ = 18490599157 is a prime.

It is a super-2 number, since 2×18490600181² (a number of 21 digits) contains 22 as substring.

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 (18490600781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9245300090 + 9245300091.

It is an arithmetic number, because the mean of its divisors is an integer number (9245300091).

Almost surely, 2^18490600181 is an apocalyptic number.

It is an amenable number.

18490600181 is a deficient number, since it is larger than the sum of its proper divisors (1).

18490600181 is an equidigital number, since it uses as much as digits as its factorization.

18490600181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 38.

The spelling of 18490600181 in words is "eighteen billion, four hundred ninety million, six hundred thousand, one hundred eighty-one".