168554443421 has 16 divisors (see below), whose sum is σ = 209465727744. Its totient is φ = 132066975744.

The previous prime is 168554443381. The next prime is 168554443433. The reversal of 168554443421 is 124344455861.

It is not a de Polignac number, because 168554443421 - 2¹⁴ = 168554427037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168554443621) 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, 8982116 + ... + 9000861.

It is an arithmetic number, because the mean of its divisors is an integer number (13091607984).

Almost surely, 2^168554443421 is an apocalyptic number.

It is an amenable number.

168554443421 is a deficient number, since it is larger than the sum of its proper divisors (40911284323).

168554443421 is a wasteful number, since it uses less digits than its factorization.

168554443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17983100.

The product of its digits is 1843200, while the sum is 47.

The spelling of 168554443421 in words is "one hundred sixty-eight billion, five hundred fifty-four million, four hundred forty-three thousand, four hundred twenty-one".