18181435201 has 2 divisors, whose sum is σ = 18181435202. Its totient is φ = 18181435200.

The previous prime is 18181435159. The next prime is 18181435219. The reversal of 18181435201 is 10253418181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17245992976 + 935442225 = 131324^2 + 30585^2 .

It is a cyclic number.

It is not a de Polignac number, because 18181435201 - 2¹⁵ = 18181402433 is a prime.

It is not a weakly prime, because it can be changed into another prime (18181435231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9090717600 + 9090717601.

It is an arithmetic number, because the mean of its divisors is an integer number (9090717601).

Almost surely, 2^18181435201 is an apocalyptic number.

It is an amenable number.

18181435201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18181435201 is an equidigital number, since it uses as much as digits as its factorization.

18181435201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 34.

The spelling of 18181435201 in words is "eighteen billion, one hundred eighty-one million, four hundred thirty-five thousand, two hundred one".