165664123503 has 8 divisors (see below), whose sum is σ = 220969399728. Its totient is φ = 110400798144.

The previous prime is 165664123481. The next prime is 165664123519. The reversal of 165664123503 is 305321466561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165664123503 - 2⁶ = 165664123439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165664123003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10478500 + ... + 10494297.

It is an arithmetic number, because the mean of its divisors is an integer number (27621174966).

Almost surely, 2^165664123503 is an apocalyptic number.

165664123503 is a deficient number, since it is larger than the sum of its proper divisors (55305276225).

165664123503 is a wasteful number, since it uses less digits than its factorization.

165664123503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20975433.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 165664123503 in words is "one hundred sixty-five billion, six hundred sixty-four million, one hundred twenty-three thousand, five hundred three".