168862643041 has 3 divisors (see below), whose sum is σ = 168863053971. Its totient is φ = 168862232112.

The previous prime is 168862643039. The next prime is 168862643063. The reversal of 168862643041 is 140346268861.

The square root of 168862643041 is 410929.

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 can be written as a sum of positive squares in only one way, i.e., 68576420641 + 100286222400 = 261871^2 + 316680^2 .

It is not a de Polignac number, because 168862643041 - 2¹ = 168862643039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168862613041) 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, 205465 + ... + 616393.

It is an arithmetic number, because the mean of its divisors is an integer number (56287684657).

Almost surely, 2^168862643041 is an apocalyptic number.

168862643041 is the 410929-th square number.

168862643041 is the 205465-th centered octagonal number.

It is an amenable number.

168862643041 is a deficient number, since it is larger than the sum of its proper divisors (410930).

168862643041 is an frugal number, since it uses more digits than its factorization.

168862643041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821858 (or 410929 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

Multiplying 168862643041 by its sum of digits (49), we get a square (8274269509009 = 2876503²).

The spelling of 168862643041 in words is "one hundred sixty-eight billion, eight hundred sixty-two million, six hundred forty-three thousand, forty-one".