19989526793 has 2 divisors, whose sum is σ = 19989526794. Its totient is φ = 19989526792.

The previous prime is 19989526741. The next prime is 19989526819. The reversal of 19989526793 is 39762598991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19815629824 + 173896969 = 140768^2 + 13187^2 .

It is a cyclic number.

It is not a de Polignac number, because 19989526793 - 2⁶ = 19989526729 is a prime.

It is not a weakly prime, because it can be changed into another prime (19989525793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994763396 + 9994763397.

It is an arithmetic number, because the mean of its divisors is an integer number (9994763397).

Almost surely, 2^19989526793 is an apocalyptic number.

It is an amenable number.

19989526793 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989526793 is an equidigital number, since it uses as much as digits as its factorization.

19989526793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66134880, while the sum is 68.

The spelling of 19989526793 in words is "nineteen billion, nine hundred eighty-nine million, five hundred twenty-six thousand, seven hundred ninety-three".