168972091589 has 8 divisors (see below), whose sum is σ = 193242252288. Its totient is φ = 144734753520.

The previous prime is 168972091543. The next prime is 168972091597. The reversal of 168972091589 is 985190279861.

It is a happy number.

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

It is not a de Polignac number, because 168972091589 - 2²⁰ = 168971043013 is a prime.

It is a super-2 number, since 2×168972091589² (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 (168972091789) 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, 8194622 + ... + 8215215.

It is an arithmetic number, because the mean of its divisors is an integer number (24155281536).

Almost surely, 2^168972091589 is an apocalyptic number.

It is an amenable number.

168972091589 is a deficient number, since it is larger than the sum of its proper divisors (24270160699).

168972091589 is a wasteful number, since it uses less digits than its factorization.

168972091589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16411315.

The product of its (nonzero) digits is 19595520, while the sum is 65.

The spelling of 168972091589 in words is "one hundred sixty-eight billion, nine hundred seventy-two million, ninety-one thousand, five hundred eighty-nine".