165311607 has 4 divisors (see below), whose sum is σ = 220415480. Its totient is φ = 110207736.

The previous prime is 165311599. The next prime is 165311659. The reversal of 165311607 is 706113561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 706113561 = 3 ⋅235371187.

It is not a de Polignac number, because 165311607 - 2³ = 165311599 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 (165311407) 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 3 ways as a sum of consecutive naturals, for example, 27551932 + ... + 27551937.

It is an arithmetic number, because the mean of its divisors is an integer number (55103870).

Almost surely, 2^165311607 is an apocalyptic number.

165311607 is a deficient number, since it is larger than the sum of its proper divisors (55103873).

165311607 is an equidigital number, since it uses as much as digits as its factorization.

165311607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55103872.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 165311607 is about 12857.3561434690. The cubic root of 165311607 is about 548.8257116768.

The spelling of 165311607 in words is "one hundred sixty-five million, three hundred eleven thousand, six hundred seven".