158643161 has 8 divisors (see below), whose sum is σ = 163149960. Its totient is φ = 154147968.

The previous prime is 158643157. The next prime is 158643187. The reversal of 158643161 is 161346851.

It can be written as a sum of positive squares in 4 ways, for example, as 99121936 + 59521225 = 9956^2 + 7715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158643161 - 2² = 158643157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158643361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30005 + ... + 34893.

It is an arithmetic number, because the mean of its divisors is an integer number (20393745).

Almost surely, 2^158643161 is an apocalyptic number.

It is an amenable number.

158643161 is a deficient number, since it is larger than the sum of its proper divisors (4506799).

158643161 is an equidigital number, since it uses as much as digits as its factorization.

158643161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5803.

The product of its digits is 17280, while the sum is 35.

The square root of 158643161 is about 12595.3626783829. The cubic root of 158643161 is about 541.3445699844.

The spelling of 158643161 in words is "one hundred fifty-eight million, six hundred forty-three thousand, one hundred sixty-one".