168259537421 has 8 divisors (see below), whose sum is σ = 168424421184. Its totient is φ = 168094723680.

The previous prime is 168259537417. The next prime is 168259537423. The reversal of 168259537421 is 124735952861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168259537421 - 2² = 168259537417 is a prime.

It is a super-2 number, since 2×168259537421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168259537423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5661761 + ... + 5691401.

It is an arithmetic number, because the mean of its divisors is an integer number (21053052648).

Almost surely, 2^168259537421 is an apocalyptic number.

It is an amenable number.

168259537421 is a deficient number, since it is larger than the sum of its proper divisors (164883763).

168259537421 is a wasteful number, since it uses less digits than its factorization.

168259537421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35011.

The product of its digits is 3628800, while the sum is 53.

The spelling of 168259537421 in words is "one hundred sixty-eight billion, two hundred fifty-nine million, five hundred thirty-seven thousand, four hundred twenty-one".