18368535197 has 2 divisors, whose sum is σ = 18368535198. Its totient is φ = 18368535196.

The previous prime is 18368535167. The next prime is 18368535257. The reversal of 18368535197 is 79153586381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16201725796 + 2166809401 = 127286^2 + 46549^2 .

It is a cyclic number.

It is not a de Polignac number, because 18368535197 - 2¹⁴ = 18368518813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18368535167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9184267598 + 9184267599.

It is an arithmetic number, because the mean of its divisors is an integer number (9184267599).

Almost surely, 2^18368535197 is an apocalyptic number.

It is an amenable number.

18368535197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18368535197 is an equidigital number, since it uses as much as digits as its factorization.

18368535197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 56.

The spelling of 18368535197 in words is "eighteen billion, three hundred sixty-eight million, five hundred thirty-five thousand, one hundred ninety-seven".