165158401 has 4 divisors (see below), whose sum is σ = 165318400. Its totient is φ = 164998404.

The previous prime is 165158387. The next prime is 165158437. The reversal of 165158401 is 104851561.

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 165158401 - 2⁵ = 165158369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165158471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78441 + ... + 80518.

It is an arithmetic number, because the mean of its divisors is an integer number (41329600).

Almost surely, 2^165158401 is an apocalyptic number.

It is an amenable number.

165158401 is a deficient number, since it is larger than the sum of its proper divisors (159999).

165158401 is a wasteful number, since it uses less digits than its factorization.

165158401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159998.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 165158401 is about 12851.3968501482. The cubic root of 165158401 is about 548.6561140258.

The spelling of 165158401 in words is "one hundred sixty-five million, one hundred fifty-eight thousand, four hundred one".