165350261 has 2 divisors, whose sum is σ = 165350262. Its totient is φ = 165350260.

The previous prime is 165350233. The next prime is 165350323. The reversal of 165350261 is 162053561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159542161 + 5808100 = 12631^2 + 2410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165350261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165350161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82675130 + 82675131.

It is an arithmetic number, because the mean of its divisors is an integer number (82675131).

Almost surely, 2^165350261 is an apocalyptic number.

It is an amenable number.

165350261 is a deficient number, since it is larger than the sum of its proper divisors (1).

165350261 is an equidigital number, since it uses as much as digits as its factorization.

165350261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 165350261 is about 12858.8592417835. The cubic root of 165350261 is about 548.8684847488.

The spelling of 165350261 in words is "one hundred sixty-five million, three hundred fifty thousand, two hundred sixty-one".