165165501 has 4 divisors (see below), whose sum is σ = 220220672. Its totient is φ = 110110332.

The previous prime is 165165463. The next prime is 165165503. The reversal of 165165501 is 105561561.

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 not a de Polignac number, because 165165501 - 2¹⁸ = 164903357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165165503) 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, 27527581 + ... + 27527586.

It is an arithmetic number, because the mean of its divisors is an integer number (55055168).

Almost surely, 2^165165501 is an apocalyptic number.

It is an amenable number.

165165501 is a deficient number, since it is larger than the sum of its proper divisors (55055171).

165165501 is an equidigital number, since it uses as much as digits as its factorization.

165165501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55055170.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 165165501 is about 12851.6730817431. The cubic root of 165165501 is about 548.6639759784.

The spelling of 165165501 in words is "one hundred sixty-five million, one hundred sixty-five thousand, five hundred one".