183818181997 has 2 divisors, whose sum is σ = 183818181998. Its totient is φ = 183818181996.

The previous prime is 183818181977. The next prime is 183818182043. The reversal of 183818181997 is 799181818381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154314623241 + 29503558756 = 392829^2 + 171766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-183818181997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (183818181977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91909090998 + 91909090999.

It is an arithmetic number, because the mean of its divisors is an integer number (91909090999).

Almost surely, 2^183818181997 is an apocalyptic number.

It is an amenable number.

183818181997 is a deficient number, since it is larger than the sum of its proper divisors (1).

183818181997 is an equidigital number, since it uses as much as digits as its factorization.

183818181997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 64.

The spelling of 183818181997 in words is "one hundred eighty-three billion, eight hundred eighteen million, one hundred eighty-one thousand, nine hundred ninety-seven".