19886125529 has 2 divisors, whose sum is σ = 19886125530. Its totient is φ = 19886125528.

The previous prime is 19886125507. The next prime is 19886125549. The reversal of 19886125529 is 92552168891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17489533504 + 2396592025 = 132248^2 + 48955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19886125529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19886125549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9943062764 + 9943062765.

It is an arithmetic number, because the mean of its divisors is an integer number (9943062765).

Almost surely, 2^19886125529 is an apocalyptic number.

It is an amenable number.

19886125529 is a deficient number, since it is larger than the sum of its proper divisors (1).

19886125529 is an equidigital number, since it uses as much as digits as its factorization.

19886125529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 56.

The spelling of 19886125529 in words is "nineteen billion, eight hundred eighty-six million, one hundred twenty-five thousand, five hundred twenty-nine".