18687330045737 has 2 divisors, whose sum is σ = 18687330045738. Its totient is φ = 18687330045736.

The previous prime is 18687330045677. The next prime is 18687330045773. The reversal of 18687330045737 is 73754003378681.

Together with next prime (18687330045773) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10468466721001 + 8218863324736 = 3235501^2 + 2866856^2 .

It is an emirp because it is prime and its reverse (73754003378681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18687330045737 - 2⁸ = 18687330045481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18687330045737.

It is not a weakly prime, because it can be changed into another prime (18687330065737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9343665022868 + 9343665022869.

It is an arithmetic number, because the mean of its divisors is an integer number (9343665022869).

Almost surely, 2^{18687330045737} is an apocalyptic number.

It is an amenable number.

18687330045737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18687330045737 is an equidigital number, since it uses as much as digits as its factorization.

18687330045737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71124480, while the sum is 62.

The spelling of 18687330045737 in words is "eighteen trillion, six hundred eighty-seven billion, three hundred thirty million, forty-five thousand, seven hundred thirty-seven".