168328857841 has 3 divisors (see below), whose sum is σ = 168329268121. Its totient is φ = 168328447562.

The previous prime is 168328857833. The next prime is 168328857869. The reversal of 168328857841 is 148758823861.

It is a happy number.

The square root of 168328857841 is 410279.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 168328857841 - 2³ = 168328857833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168328857841.

It is not an unprimeable number, because it can be changed into a prime (168328852841) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 205140 + ... + 615418.

Almost surely, 2^168328857841 is an apocalyptic number.

168328857841 is the 410279-th square number.

168328857841 is the 205140-th centered octagonal number.

It is an amenable number.

168328857841 is a deficient number, since it is larger than the sum of its proper divisors (410280).

168328857841 is an frugal number, since it uses more digits than its factorization.

168328857841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820558 (or 410279 counting only the distinct ones).

The product of its digits is 20643840, while the sum is 61.

It can be divided in two parts, 168328 and 857841, that added together give a square (1026169 = 1013²).

The spelling of 168328857841 in words is "one hundred sixty-eight billion, three hundred twenty-eight million, eight hundred fifty-seven thousand, eight hundred forty-one".