162518817821 has 4 divisors (see below), whose sum is σ = 162520223292. Its totient is φ = 162517412352.

The previous prime is 162518817787. The next prime is 162518817847. The reversal of 162518817821 is 128718815261.

162518817821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124577232025 + 37941585796 = 352955^2 + 194786^2 .

It is a cyclic number.

It is not a de Polignac number, because 162518817821 - 2¹⁴ = 162518801437 is a prime.

It is a super-2 number, since 2×162518817821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 162518817821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162518811821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512036 + ... + 766301.

It is an arithmetic number, because the mean of its divisors is an integer number (40630055823).

Almost surely, 2^162518817821 is an apocalyptic number.

It is an amenable number.

162518817821 is a deficient number, since it is larger than the sum of its proper divisors (1405471).

162518817821 is a wasteful number, since it uses less digits than its factorization.

162518817821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405470.

The product of its digits is 430080, while the sum is 50.

The spelling of 162518817821 in words is "one hundred sixty-two billion, five hundred eighteen million, eight hundred seventeen thousand, eight hundred twenty-one".