18703867135397 has 2 divisors, whose sum is σ = 18703867135398. Its totient is φ = 18703867135396.

The previous prime is 18703867135381. The next prime is 18703867135519. The reversal of 18703867135397 is 79353176830781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9403508112196 + 9300359023201 = 3066514^2 + 3049649^2 .

It is a cyclic number.

It is not a de Polignac number, because 18703867135397 - 2⁴ = 18703867135381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18703867135357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9351933567698 + 9351933567699.

It is an arithmetic number, because the mean of its divisors is an integer number (9351933567699).

Almost surely, 2^{18703867135397} is an apocalyptic number.

It is an amenable number.

18703867135397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18703867135397 is an equidigital number, since it uses as much as digits as its factorization.

18703867135397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160030080, while the sum is 68.

The spelling of 18703867135397 in words is "eighteen trillion, seven hundred three billion, eight hundred sixty-seven million, one hundred thirty-five thousand, three hundred ninety-seven".