165642041 has 2 divisors, whose sum is σ = 165642042. Its totient is φ = 165642040.

The previous prime is 165641989. The next prime is 165642049. The reversal of 165642041 is 140246561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159491641 + 6150400 = 12629^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 165642041 - 2¹⁸ = 165379897 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 165641995 and 165642013.

It is not a weakly prime, because it can be changed into another prime (165642049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82821020 + 82821021.

It is an arithmetic number, because the mean of its divisors is an integer number (82821021).

Almost surely, 2^165642041 is an apocalyptic number.

It is an amenable number.

165642041 is a deficient number, since it is larger than the sum of its proper divisors (1).

165642041 is an equidigital number, since it uses as much as digits as its factorization.

165642041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 165642041 is about 12870.1997265000. The cubic root of 165642041 is about 549.1911427179.

The spelling of 165642041 in words is "one hundred sixty-five million, six hundred forty-two thousand, forty-one".