19938806068739 has 2 divisors, whose sum is σ = 19938806068740. Its totient is φ = 19938806068738.

The previous prime is 19938806068729. The next prime is 19938806068777. The reversal of 19938806068739 is 93786060883991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19938806068739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19938806068739.

It is not a weakly prime, because it can be changed into another prime (19938806068729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9969403034369 + 9969403034370.

It is an arithmetic number, because the mean of its divisors is an integer number (9969403034370).

Almost surely, 2^{19938806068739} is an apocalyptic number.

19938806068739 is a deficient number, since it is larger than the sum of its proper divisors (1).

19938806068739 is an equidigital number, since it uses as much as digits as its factorization.

19938806068739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846526464, while the sum is 77.

The spelling of 19938806068739 in words is "nineteen trillion, nine hundred thirty-eight billion, eight hundred six million, sixty-eight thousand, seven hundred thirty-nine".