19139837945849 has 2 divisors, whose sum is σ = 19139837945850. Its totient is φ = 19139837945848.

The previous prime is 19139837945843. The next prime is 19139837945923. The reversal of 19139837945849 is 94854973893191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19114733761600 + 25104184249 = 4372040^2 + 158443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19139837945849 is a prime.

It is a super-2 number, since 2×19139837945849² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19139837945843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9569918972924 + 9569918972925.

It is an arithmetic number, because the mean of its divisors is an integer number (9569918972925).

Almost surely, 2^{19139837945849} is an apocalyptic number.

It is an amenable number.

19139837945849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19139837945849 is an equidigital number, since it uses as much as digits as its factorization.

19139837945849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116316160, while the sum is 80.

The spelling of 19139837945849 in words is "nineteen trillion, one hundred thirty-nine billion, eight hundred thirty-seven million, nine hundred forty-five thousand, eight hundred forty-nine".