165671157 has 4 divisors (see below), whose sum is σ = 220894880. Its totient is φ = 110447436.

The previous prime is 165671141. The next prime is 165671159. The reversal of 165671157 is 751176561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 751176561 = 3 ⋅250392187.

It is not a de Polignac number, because 165671157 - 2⁴ = 165671141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165671159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27611857 + ... + 27611862.

It is an arithmetic number, because the mean of its divisors is an integer number (55223720).

Almost surely, 2^165671157 is an apocalyptic number.

It is an amenable number.

165671157 is a deficient number, since it is larger than the sum of its proper divisors (55223723).

165671157 is an equidigital number, since it uses as much as digits as its factorization.

165671157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55223722.

The product of its digits is 44100, while the sum is 39.

The square root of 165671157 is about 12871.3308169746. The cubic root of 165671157 is about 549.2233191558.

The spelling of 165671157 in words is "one hundred sixty-five million, six hundred seventy-one thousand, one hundred fifty-seven".