19388040169 has 2 divisors, whose sum is σ = 19388040170. Its totient is φ = 19388040168.

The previous prime is 19388040157. The next prime is 19388040227. The reversal of 19388040169 is 96104088391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19122741225 + 265298944 = 138285^2 + 16288^2 .

It is a cyclic number.

It is not a de Polignac number, because 19388040169 - 2⁵ = 19388040137 is a prime.

It is a super-2 number, since 2×19388040169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19388040109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9694020084 + 9694020085.

It is an arithmetic number, because the mean of its divisors is an integer number (9694020085).

Almost surely, 2^19388040169 is an apocalyptic number.

It is an amenable number.

19388040169 is a deficient number, since it is larger than the sum of its proper divisors (1).

19388040169 is an equidigital number, since it uses as much as digits as its factorization.

19388040169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 19388040169 in words is "nineteen billion, three hundred eighty-eight million, forty thousand, one hundred sixty-nine".