165523243 has 2 divisors, whose sum is σ = 165523244. Its totient is φ = 165523242.

The previous prime is 165523199. The next prime is 165523283. The reversal of 165523243 is 342325561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165523243 is a prime.

It is not a weakly prime, because it can be changed into another prime (165523283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82761621 + 82761622.

It is an arithmetic number, because the mean of its divisors is an integer number (82761622).

Almost surely, 2^165523243 is an apocalyptic number.

165523243 is a deficient number, since it is larger than the sum of its proper divisors (1).

165523243 is an equidigital number, since it uses as much as digits as its factorization.

165523243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 31.

The square root of 165523243 is about 12865.5836634021. The cubic root of 165523243 is about 549.0598185434.

The spelling of 165523243 in words is "one hundred sixty-five million, five hundred twenty-three thousand, two hundred forty-three".