165641597 has 4 divisors (see below), whose sum is σ = 180699936. Its totient is φ = 150583260.

The previous prime is 165641569. The next prime is 165641617. The reversal of 165641597 is 795146561.

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 165641597 - 2¹² = 165637501 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 (165641537) 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, 7529153 + ... + 7529174.

It is an arithmetic number, because the mean of its divisors is an integer number (45174984).

Almost surely, 2^165641597 is an apocalyptic number.

It is an amenable number.

165641597 is a deficient number, since it is larger than the sum of its proper divisors (15058339).

165641597 is a wasteful number, since it uses less digits than its factorization.

165641597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15058338.

The product of its digits is 226800, while the sum is 44.

The square root of 165641597 is about 12870.1824773389. The cubic root of 165641597 is about 549.1906520191.

The spelling of 165641597 in words is "one hundred sixty-five million, six hundred forty-one thousand, five hundred ninety-seven".