165826645 has 4 divisors (see below), whose sum is σ = 198991980. Its totient is φ = 132661312.

The previous prime is 165826643. The next prime is 165826649. The reversal of 165826645 is 546628561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546628561 = 3449 ⋅158489.

It can be written as a sum of positive squares in 2 ways, for example, as 81884401 + 83942244 = 9049^2 + 9162^2 .

It is a cyclic number.

It is not a de Polignac number, because 165826645 - 2¹ = 165826643 is a prime.

It is a super-3 number, since 3×165826645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165826643) 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, 16582660 + ... + 16582669.

It is an arithmetic number, because the mean of its divisors is an integer number (49747995).

Almost surely, 2^165826645 is an apocalyptic number.

It is an amenable number.

165826645 is a deficient number, since it is larger than the sum of its proper divisors (33165335).

165826645 is an equidigital number, since it uses as much as digits as its factorization.

165826645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33165334.

The product of its digits is 345600, while the sum is 43.

The square root of 165826645 is about 12877.3694906996. The cubic root of 165826645 is about 549.3950870014.

The spelling of 165826645 in words is "one hundred sixty-five million, eight hundred twenty-six thousand, six hundred forty-five".