18196937897 has 2 divisors, whose sum is σ = 18196937898. Its totient is φ = 18196937896.

The previous prime is 18196937881. The next prime is 18196937933. The reversal of 18196937897 is 79873969181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17978519056 + 218418841 = 134084^2 + 14779^2 .

It is a cyclic number.

It is not a de Polignac number, because 18196937897 - 2⁴ = 18196937881 is a prime.

It is a super-2 number, since 2×18196937897² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18196937867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9098468948 + 9098468949.

It is an arithmetic number, because the mean of its divisors is an integer number (9098468949).

Almost surely, 2^18196937897 is an apocalyptic number.

It is an amenable number.

18196937897 is a deficient number, since it is larger than the sum of its proper divisors (1).

18196937897 is an equidigital number, since it uses as much as digits as its factorization.

18196937897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41150592, while the sum is 68.

The spelling of 18196937897 in words is "eighteen billion, one hundred ninety-six million, nine hundred thirty-seven thousand, eight hundred ninety-seven".