158109668209 has 4 divisors (see below), whose sum is σ = 158111708580. Its totient is φ = 158107627840.

The previous prime is 158109668203. The next prime is 158109668219. The reversal of 158109668209 is 902866901851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130734311184 + 27375357025 = 361572^2 + 165455^2 .

It is a cyclic number.

It is not a de Polignac number, because 158109668209 - 2³ = 158109668201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158109668209.

It is not an unprimeable number, because it can be changed into a prime (158109668201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 899164 + ... + 1060525.

It is an arithmetic number, because the mean of its divisors is an integer number (39527927145).

Almost surely, 2^158109668209 is an apocalyptic number.

It is an amenable number.

158109668209 is a deficient number, since it is larger than the sum of its proper divisors (2040371).

158109668209 is an equidigital number, since it uses as much as digits as its factorization.

158109668209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040370.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 158109668209 in words is "one hundred fifty-eight billion, one hundred nine million, six hundred sixty-eight thousand, two hundred nine".