158857332989 has 2 divisors, whose sum is σ = 158857332990. Its totient is φ = 158857332988.

The previous prime is 158857332979. The next prime is 158857333031. The reversal of 158857332989 is 989233758851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89830280089 + 69027052900 = 299717^2 + 262730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158857332989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158857332919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79428666494 + 79428666495.

It is an arithmetic number, because the mean of its divisors is an integer number (79428666495).

Almost surely, 2^158857332989 is an apocalyptic number.

It is an amenable number.

158857332989 is a deficient number, since it is larger than the sum of its proper divisors (1).

158857332989 is an equidigital number, since it uses as much as digits as its factorization.

158857332989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 130636800, while the sum is 68.

The spelling of 158857332989 in words is "one hundred fifty-eight billion, eight hundred fifty-seven million, three hundred thirty-two thousand, nine hundred eighty-nine".