158165993 has 4 divisors (see below), whose sum is σ = 158526720. Its totient is φ = 157805268.

The previous prime is 158165989. The next prime is 158166017. The reversal of 158165993 is 399561851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 158165993 - 2² = 158165989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (158165923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179705 + ... + 180582.

It is an arithmetic number, because the mean of its divisors is an integer number (39631680).

Almost surely, 2^158165993 is an apocalyptic number.

It is an amenable number.

158165993 is a deficient number, since it is larger than the sum of its proper divisors (360727).

158165993 is an equidigital number, since it uses as much as digits as its factorization.

158165993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360726.

The product of its digits is 291600, while the sum is 47.

The square root of 158165993 is about 12576.4062036816. The cubic root of 158165993 is about 540.8012715900.

The spelling of 158165993 in words is "one hundred fifty-eight million, one hundred sixty-five thousand, nine hundred ninety-three".