165857497 has 4 divisors (see below), whose sum is σ = 178615780. Its totient is φ = 153099216.

The previous prime is 165857449. The next prime is 165857507. The reversal of 165857497 is 794758561.

165857497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44769481 + 121088016 = 6691^2 + 11004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165857497 is a prime.

It is a super-2 number, since 2×165857497² = 55017418622210018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165857297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6379122 + ... + 6379147.

It is an arithmetic number, because the mean of its divisors is an integer number (44653945).

Almost surely, 2^165857497 is an apocalyptic number.

It is an amenable number.

165857497 is a deficient number, since it is larger than the sum of its proper divisors (12758283).

165857497 is a wasteful number, since it uses less digits than its factorization.

165857497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12758282.

The product of its digits is 2116800, while the sum is 52.

The square root of 165857497 is about 12878.5673504470. The cubic root of 165857497 is about 549.4291564884.

The spelling of 165857497 in words is "one hundred sixty-five million, eight hundred fifty-seven thousand, four hundred ninety-seven".