18871443975737 has 2 divisors, whose sum is σ = 18871443975738. Its totient is φ = 18871443975736.

The previous prime is 18871443975551. The next prime is 18871443975763. The reversal of 18871443975737 is 73757934417881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18860571951376 + 10872024361 = 4342876^2 + 104269^2 .

It is a cyclic number.

It is not a de Polignac number, because 18871443975737 - 2⁸ = 18871443975481 is a prime.

It is a super-2 number, since 2×18871443975737² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18871443935737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9435721987868 + 9435721987869.

It is an arithmetic number, because the mean of its divisors is an integer number (9435721987869).

Almost surely, 2^{18871443975737} is an apocalyptic number.

It is an amenable number.

18871443975737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18871443975737 is an equidigital number, since it uses as much as digits as its factorization.

18871443975737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995742720, while the sum is 74.

The spelling of 18871443975737 in words is "eighteen trillion, eight hundred seventy-one billion, four hundred forty-three million, nine hundred seventy-five thousand, seven hundred thirty-seven".