18708131435407 has 2 divisors, whose sum is σ = 18708131435408. Its totient is φ = 18708131435406.

The previous prime is 18708131435339. The next prime is 18708131435449. The reversal of 18708131435407 is 70453413180781.

It is a strong prime.

It is an emirp because it is prime and its reverse (70453413180781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18708131435407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18708131435467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354065717703 + 9354065717704.

It is an arithmetic number, because the mean of its divisors is an integer number (9354065717704).

Almost surely, 2^{18708131435407} is an apocalyptic number.

18708131435407 is a deficient number, since it is larger than the sum of its proper divisors (1).

18708131435407 is an equidigital number, since it uses as much as digits as its factorization.

18708131435407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 18708131435407 in words is "eighteen trillion, seven hundred eight billion, one hundred thirty-one million, four hundred thirty-five thousand, four hundred seven".