19389887953 has 2 divisors, whose sum is σ = 19389887954. Its totient is φ = 19389887952.

The previous prime is 19389887927. The next prime is 19389887981. The reversal of 19389887953 is 35978898391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13940052624 + 5449835329 = 118068^2 + 73823^2 .

It is a cyclic number.

It is not a de Polignac number, because 19389887953 - 2²⁹ = 18853017041 is a prime.

It is not a weakly prime, because it can be changed into another prime (19389887453) 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, 9694943976 + 9694943977.

It is an arithmetic number, because the mean of its divisors is an integer number (9694943977).

Almost surely, 2^19389887953 is an apocalyptic number.

It is an amenable number.

19389887953 is a deficient number, since it is larger than the sum of its proper divisors (1).

19389887953 is an equidigital number, since it uses as much as digits as its factorization.

19389887953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117573120, while the sum is 70.

The spelling of 19389887953 in words is "nineteen billion, three hundred eighty-nine million, eight hundred eighty-seven thousand, nine hundred fifty-three".