168443172736 has 64 divisors (see below), whose sum is σ = 353328714000. Its totient is φ = 79767023616.

The previous prime is 168443172659. The next prime is 168443172797. The reversal of 168443172736 is 637271344861.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11999770 + ... + 12013798.

Almost surely, 2^168443172736 is an apocalyptic number.

168443172736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168443172736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176664357000).

168443172736 is an abundant number, since it is smaller than the sum of its proper divisors (184885541264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168443172736 is a wasteful number, since it uses less digits than its factorization.

168443172736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18999 (or 18987 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 52.

The spelling of 168443172736 in words is "one hundred sixty-eight billion, four hundred forty-three million, one hundred seventy-two thousand, seven hundred thirty-six".