19798728440237 has 2 divisors, whose sum is σ = 19798728440238. Its totient is φ = 19798728440236.

The previous prime is 19798728440213. The next prime is 19798728440321. The reversal of 19798728440237 is 73204482789791.

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., 19739591441476 + 59136998761 = 4442926^2 + 243181^2 .

It is a cyclic number.

It is not a de Polignac number, because 19798728440237 - 2⁶ = 19798728440173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19798728440837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9899364220118 + 9899364220119.

It is an arithmetic number, because the mean of its divisors is an integer number (9899364220119).

Almost surely, 2^{19798728440237} is an apocalyptic number.

It is an amenable number.

19798728440237 is a deficient number, since it is larger than the sum of its proper divisors (1).

19798728440237 is an equidigital number, since it uses as much as digits as its factorization.

19798728440237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 341397504, while the sum is 71.

The spelling of 19798728440237 in words is "nineteen trillion, seven hundred ninety-eight billion, seven hundred twenty-eight million, four hundred forty thousand, two hundred thirty-seven".