168123780841 has 3 divisors (see below), whose sum is σ = 168124190871. Its totient is φ = 168123370812.

The previous prime is 168123780833. The next prime is 168123780859. The reversal of 168123780841 is 148087321861.

The square root of 168123780841 is 410029.

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, and also an emirpimes, since its reverse is a distinct semiprime: 148087321861 = 17 ⋅8711018933.

It can be written as a sum of positive squares in only one way, i.e., 141548260441 + 26575520400 = 376229^2 + 163020^2 .

It is not a de Polignac number, because 168123780841 - 2³ = 168123780833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168123781841) 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, 205015 + ... + 615043.

It is an arithmetic number, because the mean of its divisors is an integer number (56041396957).

Almost surely, 2^168123780841 is an apocalyptic number.

168123780841 is the 410029-th square number.

168123780841 is the 205015-th centered octagonal number.

It is an amenable number.

168123780841 is a deficient number, since it is larger than the sum of its proper divisors (410030).

168123780841 is an frugal number, since it uses more digits than its factorization.

168123780841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820058 (or 410029 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

Multiplying 168123780841 by its sum of digits (49), we get a square (8238065261209 = 2870203²).

The spelling of 168123780841 in words is "one hundred sixty-eight billion, one hundred twenty-three million, seven hundred eighty thousand, eight hundred forty-one".