19726920089 has 2 divisors, whose sum is σ = 19726920090. Its totient is φ = 19726920088.

The previous prime is 19726920049. The next prime is 19726920097. The reversal of 19726920089 is 98002962791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10498051600 + 9228868489 = 102460^2 + 96067^2 .

It is a cyclic number.

It is not a de Polignac number, because 19726920089 - 2¹² = 19726915993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19726920089.

It is not a weakly prime, because it can be changed into another prime (19726920019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9863460044 + 9863460045.

It is an arithmetic number, because the mean of its divisors is an integer number (9863460045).

Almost surely, 2^19726920089 is an apocalyptic number.

It is an amenable number.

19726920089 is a deficient number, since it is larger than the sum of its proper divisors (1).

19726920089 is an equidigital number, since it uses as much as digits as its factorization.

19726920089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 19726920089 in words is "nineteen billion, seven hundred twenty-six million, nine hundred twenty thousand, eighty-nine".