19746064889 has 2 divisors, whose sum is σ = 19746064890. Its totient is φ = 19746064888.

The previous prime is 19746064853. The next prime is 19746064937. The reversal of 19746064889 is 98846064791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19674831289 + 71233600 = 140267^2 + 8440^2 .

It is an emirp because it is prime and its reverse (98846064791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19746064889 - 2⁸ = 19746064633 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 (19746064829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9873032444 + 9873032445.

It is an arithmetic number, because the mean of its divisors is an integer number (9873032445).

Almost surely, 2^19746064889 is an apocalyptic number.

It is an amenable number.

19746064889 is a deficient number, since it is larger than the sum of its proper divisors (1).

19746064889 is an equidigital number, since it uses as much as digits as its factorization.

19746064889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20901888, while the sum is 62.

The spelling of 19746064889 in words is "nineteen billion, seven hundred forty-six million, sixty-four thousand, eight hundred eighty-nine".