162721021491168 has 96 divisors (see below), whose sum is σ = 504996273653760. Its totient is φ = 44888557647360.

The previous prime is 162721021491167. The next prime is 162721021491181. The reversal of 162721021491168 is 861194120127261.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 162721021491168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162721021491167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4174883568 + ... + 4174922543.

It is an arithmetic number, because the mean of its divisors is an integer number (5260377850560).

Almost surely, 2^{162721021491168} is an apocalyptic number.

It is an amenable number.

162721021491168 is an abundant number, since it is smaller than the sum of its proper divisors (342275252162592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

162721021491168 is a wasteful number, since it uses less digits than its factorization.

162721021491168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8349806160 (or 8349806152 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 162721021491168 in words is "one hundred sixty-two trillion, seven hundred twenty-one billion, twenty-one million, four hundred ninety-one thousand, one hundred sixty-eight".