19992538793 has 2 divisors, whose sum is σ = 19992538794. Its totient is φ = 19992538792.

The previous prime is 19992538771. The next prime is 19992538861. The reversal of 19992538793 is 39783529991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16324661824 + 3667876969 = 127768^2 + 60563^2 .

It is a cyclic number.

It is not a de Polignac number, because 19992538793 - 2⁸ = 19992538537 is a prime.

It is not a weakly prime, because it can be changed into another prime (19992538733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9996269396 + 9996269397.

It is an arithmetic number, because the mean of its divisors is an integer number (9996269397).

Almost surely, 2^19992538793 is an apocalyptic number.

It is an amenable number.

19992538793 is a deficient number, since it is larger than the sum of its proper divisors (1).

19992538793 is an equidigital number, since it uses as much as digits as its factorization.

19992538793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33067440, while the sum is 65.

The spelling of 19992538793 in words is "nineteen billion, nine hundred ninety-two million, five hundred thirty-eight thousand, seven hundred ninety-three".