161818526423201 has 8 divisors (see below), whose sum is σ = 161967075379200. Its totient is φ = 161670043775680.

The previous prime is 161818526423179. The next prime is 161818526423219. The reversal of 161818526423201 is 102324625818161.

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

It is a cyclic number.

It is not a de Polignac number, because 161818526423201 - 2¹⁰ = 161818526422177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161818526423201.

It is not an unprimeable number, because it can be changed into a prime (161818526423291) 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, 11693441 + ... + 21456318.

It is an arithmetic number, because the mean of its divisors is an integer number (20245884422400).

Almost surely, 2^{161818526423201} is an apocalyptic number.

It is an amenable number.

161818526423201 is a deficient number, since it is larger than the sum of its proper divisors (148548955999).

161818526423201 is a wasteful number, since it uses less digits than its factorization.

161818526423201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33154239.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 161818526423201 in words is "one hundred sixty-one trillion, eight hundred eighteen billion, five hundred twenty-six million, four hundred twenty-three thousand, two hundred one".