1989665158807 has 2 divisors, whose sum is σ = 1989665158808. Its totient is φ = 1989665158806.

The previous prime is 1989665158801. The next prime is 1989665158907. The reversal of 1989665158807 is 7088515669891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1989665158807 - 2³¹ = 1987517675159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1989665158807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989665158801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994832579403 + 994832579404.

It is an arithmetic number, because the mean of its divisors is an integer number (994832579404).

Almost surely, 2^{1989665158807} is an apocalyptic number.

1989665158807 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989665158807 is an equidigital number, since it uses as much as digits as its factorization.

1989665158807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 261273600, while the sum is 73.

The spelling of 1989665158807 in words is "one trillion, nine hundred eighty-nine billion, six hundred sixty-five million, one hundred fifty-eight thousand, eight hundred seven".