158165663 has 6 divisors (see below), whose sum is σ = 160199424. Its totient is φ = 156157404.

The previous prime is 158165629. The next prime is 158165677. The reversal of 158165663 is 366561851.

It is not a de Polignac number, because 158165663 - 2¹⁸ = 157903519 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 158165663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158165563) 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 5 ways as a sum of consecutive naturals, for example, 6431 + ... + 18912.

It is an arithmetic number, because the mean of its divisors is an integer number (26699904).

Almost surely, 2^158165663 is an apocalyptic number.

158165663 is a deficient number, since it is larger than the sum of its proper divisors (2033761).

158165663 is an frugal number, since it uses more digits than its factorization.

158165663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25501 (or 25422 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

The square root of 158165663 is about 12576.3930838695. The cubic root of 158165663 is about 540.8008954777.

The spelling of 158165663 in words is "one hundred fifty-eight million, one hundred sixty-five thousand, six hundred sixty-three".