165250123 has 4 divisors (see below), whose sum is σ = 165299128. Its totient is φ = 165201120.

The previous prime is 165250121. The next prime is 165250133. The reversal of 165250123 is 321052561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321052561 = 23 ⋅13958807.

It is a cyclic number.

It is not a de Polignac number, because 165250123 - 2¹ = 165250121 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165250121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19038 + ... + 26323.

It is an arithmetic number, because the mean of its divisors is an integer number (41324782).

Almost surely, 2^165250123 is an apocalyptic number.

165250123 is a deficient number, since it is larger than the sum of its proper divisors (49005).

165250123 is an equidigital number, since it uses as much as digits as its factorization.

165250123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49004.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 165250123 is about 12854.9649163271. The cubic root of 165250123 is about 548.7576620402.

The spelling of 165250123 in words is "one hundred sixty-five million, two hundred fifty thousand, one hundred twenty-three".