165102661 has 4 divisors (see below), whose sum is σ = 167809324. Its totient is φ = 162396000.

The previous prime is 165102659. The next prime is 165102701. The reversal of 165102661 is 166201561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166201561 = 5651 ⋅29411.

It can be written as a sum of positive squares in 2 ways, for example, as 95062500 + 70040161 = 9750^2 + 8369^2 .

It is a cyclic number.

It is not a de Polignac number, because 165102661 - 2¹ = 165102659 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 (165102601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1353240 + ... + 1353361.

It is an arithmetic number, because the mean of its divisors is an integer number (41952331).

Almost surely, 2^165102661 is an apocalyptic number.

It is an amenable number.

165102661 is a deficient number, since it is larger than the sum of its proper divisors (2706663).

165102661 is an equidigital number, since it uses as much as digits as its factorization.

165102661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706662.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 165102661 is about 12849.2280312865. The cubic root of 165102661 is about 548.5943843314.

The spelling of 165102661 in words is "one hundred sixty-five million, one hundred two thousand, six hundred sixty-one".