863340163921 has 3 divisors (see below), whose sum is σ = 863341093083. Its totient is φ = 863339234760.

The previous prime is 863340163909. The next prime is 863340163957. The reversal of 863340163921 is 129361043368.

The square root of 863340163921 is 929161.

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., 727798378321 + 135541785600 = 853111^2 + 368160^2 .

It is a de Polignac number, because none of the positive numbers 2^k-863340163921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863340163991) 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 2 ways as a sum of consecutive naturals, for example, 464581 + ... + 1393741.

It is an arithmetic number, because the mean of its divisors is an integer number (287780364361).

Almost surely, 2^863340163921 is an apocalyptic number.

863340163921 is the 929161-st square number.

863340163921 is the 464581-st centered octagonal number.

It is an amenable number.

863340163921 is a deficient number, since it is larger than the sum of its proper divisors (929162).

863340163921 is an frugal number, since it uses more digits than its factorization.

863340163921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858322 (or 929161 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 863340163921 in words is "eight hundred sixty-three billion, three hundred forty million, one hundred sixty-three thousand, nine hundred twenty-one".