18196938157 has 2 divisors, whose sum is σ = 18196938158. Its totient is φ = 18196938156.

The previous prime is 18196938139. The next prime is 18196938167. The reversal of 18196938157 is 75183969181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18045623556 + 151314601 = 134334^2 + 12301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18196938157 is a prime.

It is a super-2 number, since 2×18196938157² (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 (18196938107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9098469078 + 9098469079.

It is an arithmetic number, because the mean of its divisors is an integer number (9098469079).

Almost surely, 2^18196938157 is an apocalyptic number.

It is an amenable number.

18196938157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18196938157 is an equidigital number, since it uses as much as digits as its factorization.

18196938157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 58.

The spelling of 18196938157 in words is "eighteen billion, one hundred ninety-six million, nine hundred thirty-eight thousand, one hundred fifty-seven".