163816712725021 has 16 divisors (see below), whose sum is σ = 166796939563200. Its totient is φ = 160856421602688.

The previous prime is 163816712724991. The next prime is 163816712725027. The reversal of 163816712725021 is 120527217618361.

It is a cyclic number.

It is not a de Polignac number, because 163816712725021 - 2³¹ = 163814565241373 is a prime.

It is a super-4 number, since 4×163816712725021⁴ (a number of 58 digits) contains 4444 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 163816712725021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163816712725027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709603950 + ... + 709834768.

It is an arithmetic number, because the mean of its divisors is an integer number (10424808722700).

Almost surely, 2^{163816712725021} is an apocalyptic number.

It is an amenable number.

163816712725021 is a deficient number, since it is larger than the sum of its proper divisors (2980226838179).

163816712725021 is a wasteful number, since it uses less digits than its factorization.

163816712725021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273948.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 163816712725021 in words is "one hundred sixty-three trillion, eight hundred sixteen billion, seven hundred twelve million, seven hundred twenty-five thousand, twenty-one".