18333350197 has 2 divisors, whose sum is σ = 18333350198. Its totient is φ = 18333350196.

The previous prime is 18333350177. The next prime is 18333350213. The reversal of 18333350197 is 79105333381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14551838161 + 3781512036 = 120631^2 + 61494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18333350197 is a prime.

It is a super-2 number, since 2×18333350197² (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 (18333350107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9166675098 + 9166675099.

It is an arithmetic number, because the mean of its divisors is an integer number (9166675099).

Almost surely, 2^18333350197 is an apocalyptic number.

It is an amenable number.

18333350197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18333350197 is an equidigital number, since it uses as much as digits as its factorization.

18333350197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 18333350197 in words is "eighteen billion, three hundred thirty-three million, three hundred fifty thousand, one hundred ninety-seven".