19978250029 has 2 divisors, whose sum is σ = 19978250030. Its totient is φ = 19978250028.

The previous prime is 19978250027. The next prime is 19978250063. The reversal of 19978250029 is 92005287991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19909774404 + 68475625 = 141102^2 + 8275^2 .

It is a cyclic number.

It is not a de Polignac number, because 19978250029 - 2¹ = 19978250027 is a prime.

Together with 19978250027, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19978250021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989125014 + 9989125015.

It is an arithmetic number, because the mean of its divisors is an integer number (9989125015).

Almost surely, 2^19978250029 is an apocalyptic number.

It is an amenable number.

19978250029 is a deficient number, since it is larger than the sum of its proper divisors (1).

19978250029 is an equidigital number, since it uses as much as digits as its factorization.

19978250029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 52.

The spelling of 19978250029 in words is "nineteen billion, nine hundred seventy-eight million, two hundred fifty thousand, twenty-nine".