18910986345137 has 2 divisors, whose sum is σ = 18910986345138. Its totient is φ = 18910986345136.

The previous prime is 18910986345103. The next prime is 18910986345157. The reversal of 18910986345137 is 73154368901981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14285557581376 + 4625428763761 = 3779624^2 + 2150681^2 .

It is a cyclic number.

It is not a de Polignac number, because 18910986345137 - 2¹⁴ = 18910986328753 is a prime.

It is not a weakly prime, because it can be changed into another prime (18910986345157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9455493172568 + 9455493172569.

It is an arithmetic number, because the mean of its divisors is an integer number (9455493172569).

Almost surely, 2^{18910986345137} is an apocalyptic number.

It is an amenable number.

18910986345137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18910986345137 is an equidigital number, since it uses as much as digits as its factorization.

18910986345137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 18910986345137 in words is "eighteen trillion, nine hundred ten billion, nine hundred eighty-six million, three hundred forty-five thousand, one hundred thirty-seven".