165542837 has 4 divisors (see below), whose sum is σ = 168256716. Its totient is φ = 162828960.

The previous prime is 165542827. The next prime is 165542851. The reversal of 165542837 is 738245561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 738245561 = 1933 ⋅381917.

It can be written as a sum of positive squares in 2 ways, for example, as 43970161 + 121572676 = 6631^2 + 11026^2 .

It is a cyclic number.

It is not a de Polignac number, because 165542837 - 2²² = 161348533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165542794 and 165542803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165542827) 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, 1356848 + ... + 1356969.

It is an arithmetic number, because the mean of its divisors is an integer number (42064179).

Almost surely, 2^165542837 is an apocalyptic number.

It is an amenable number.

165542837 is a deficient number, since it is larger than the sum of its proper divisors (2713879).

165542837 is an equidigital number, since it uses as much as digits as its factorization.

165542837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713878.

The product of its digits is 201600, while the sum is 41.

The square root of 165542837 is about 12866.3451298339. The cubic root of 165542837 is about 549.0814828797.

It can be divided in two parts, 16554 and 2837, that added together give a palindrome (19391).

The spelling of 165542837 in words is "one hundred sixty-five million, five hundred forty-two thousand, eight hundred thirty-seven".