165555641 has 4 divisors (see below), whose sum is σ = 165606912. Its totient is φ = 165504372.

The previous prime is 165555629. The next prime is 165555653. The reversal of 165555641 is 146555561.

It is a happy number.

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: 146555561 = 4793 ⋅30577.

It is an interprime number because it is at equal distance from previous prime (165555629) and next prime (165555653).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165555641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165555595 and 165555604.

It is not an unprimeable number, because it can be changed into a prime (165555601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20441 + ... + 27366.

It is an arithmetic number, because the mean of its divisors is an integer number (41401728).

Almost surely, 2^165555641 is an apocalyptic number.

It is an amenable number.

165555641 is a deficient number, since it is larger than the sum of its proper divisors (51271).

165555641 is an equidigital number, since it uses as much as digits as its factorization.

165555641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51270.

The product of its digits is 90000, while the sum is 38.

The square root of 165555641 is about 12866.8426974142. The cubic root of 165555641 is about 549.0956388492.

The spelling of 165555641 in words is "one hundred sixty-five million, five hundred fifty-five thousand, six hundred forty-one".