168793839973521 has 128 divisors (see below), whose sum is σ = 295958086778880. Its totient is φ = 93041913081600.

The previous prime is 168793839973439. The next prime is 168793839973531. The reversal of 168793839973521 is 125379938397861.

It is a happy number.

168793839973521 is a `hidden beast` number, since 1 + 6 + 8 + 7 + 9 + 3 + 83 + 9 + 9 + 7 + 3 + 521 = 666.

It is not a de Polignac number, because 168793839973521 - 2¹⁰ = 168793839972497 is a prime.

It is a super-2 number, since 2×168793839973521² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168793839973531) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2368635031 + ... + 2368706291.

It is an arithmetic number, because the mean of its divisors is an integer number (2312172552960).

Almost surely, 2^{168793839973521} is an apocalyptic number.

It is an amenable number.

168793839973521 is a deficient number, since it is larger than the sum of its proper divisors (127164246805359).

168793839973521 is a wasteful number, since it uses less digits than its factorization.

168793839973521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72604 (or 72598 counting only the distinct ones).

The product of its digits is 3703553280, while the sum is 81.

The spelling of 168793839973521 in words is "one hundred sixty-eight trillion, seven hundred ninety-three billion, eight hundred thirty-nine million, nine hundred seventy-three thousand, five hundred twenty-one".