165041641 has 4 divisors (see below), whose sum is σ = 166134784. Its totient is φ = 163948500.

The previous prime is 165041633. The next prime is 165041651. The reversal of 165041641 is 146140561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 146140561 = 7 ⋅20877223.

It is a cyclic number.

It is not a de Polignac number, because 165041641 - 2³ = 165041633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165041621) 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, 546345 + ... + 546646.

It is an arithmetic number, because the mean of its divisors is an integer number (41533696).

Almost surely, 2^165041641 is an apocalyptic number.

It is an amenable number.

165041641 is a deficient number, since it is larger than the sum of its proper divisors (1093143).

165041641 is a wasteful number, since it uses less digits than its factorization.

165041641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093142.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 165041641 is about 12846.8533501399. The cubic root of 165041641 is about 548.5267913279.

It can be divided in two parts, 16504 and 1641, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 165041641 in words is "one hundred sixty-five million, forty-one thousand, six hundred forty-one".