158820125809 has 2 divisors, whose sum is σ = 158820125810. Its totient is φ = 158820125808.

The previous prime is 158820125777. The next prime is 158820125833. The reversal of 158820125809 is 908521028851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134801325409 + 24018800400 = 367153^2 + 154980^2 .

It is a cyclic number.

It is not a de Polignac number, because 158820125809 - 2⁵ = 158820125777 is a prime.

It is not a weakly prime, because it can be changed into another prime (158820125869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79410062904 + 79410062905.

It is an arithmetic number, because the mean of its divisors is an integer number (79410062905).

Almost surely, 2^158820125809 is an apocalyptic number.

It is an amenable number.

158820125809 is a deficient number, since it is larger than the sum of its proper divisors (1).

158820125809 is an equidigital number, since it uses as much as digits as its factorization.

158820125809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 49.

The spelling of 158820125809 in words is "one hundred fifty-eight billion, eight hundred twenty million, one hundred twenty-five thousand, eight hundred nine".