18994507174337 has 2 divisors, whose sum is σ = 18994507174338. Its totient is φ = 18994507174336.

The previous prime is 18994507174333. The next prime is 18994507174367. The reversal of 18994507174337 is 73347170549981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16035611793601 + 2958895380736 = 4004449^2 + 1720144^2 .

It is an emirp because it is prime and its reverse (73347170549981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18994507174337 - 2² = 18994507174333 is a prime.

It is a super-2 number, since 2×18994507174337² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18994507174333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9497253587168 + 9497253587169.

It is an arithmetic number, because the mean of its divisors is an integer number (9497253587169).

Almost surely, 2^{18994507174337} is an apocalyptic number.

It is an amenable number.

18994507174337 is a deficient number, since it is larger than the sum of its proper divisors (1).

18994507174337 is an equidigital number, since it uses as much as digits as its factorization.

18994507174337 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 18994507174337 in words is "eighteen trillion, nine hundred ninety-four billion, five hundred seven million, one hundred seventy-four thousand, three hundred thirty-seven".