19989765894727 has 2 divisors, whose sum is σ = 19989765894728. Its totient is φ = 19989765894726.

The previous prime is 19989765894673. The next prime is 19989765894781. The reversal of 19989765894727 is 72749856798991.

It is a balanced prime because it is at equal distance from previous prime (19989765894673) and next prime (19989765894781).

It is a cyclic number.

It is not a de Polignac number, because 19989765894727 - 2³⁹ = 19440010080839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19989765894797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994882947363 + 9994882947364.

It is an arithmetic number, because the mean of its divisors is an integer number (9994882947364).

Almost surely, 2^{19989765894727} is an apocalyptic number.

19989765894727 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989765894727 is an equidigital number, since it uses as much as digits as its factorization.

19989765894727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34566497280, while the sum is 91.

The spelling of 19989765894727 in words is "nineteen trillion, nine hundred eighty-nine billion, seven hundred sixty-five million, eight hundred ninety-four thousand, seven hundred twenty-seven".