671856200441 has 4 divisors (see below), whose sum is σ = 672080080884. Its totient is φ = 671632320000.

The previous prime is 671856200363. The next prime is 671856200479. The reversal of 671856200441 is 144002658176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 509289186025 + 162567014416 = 713645^2 + 403196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671856200441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671856200392 and 671856200401.

It is not an unprimeable number, because it can be changed into a prime (671856202441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111935720 + ... + 111941721.

It is an arithmetic number, because the mean of its divisors is an integer number (168020020221).

Almost surely, 2^671856200441 is an apocalyptic number.

It is an amenable number.

671856200441 is a deficient number, since it is larger than the sum of its proper divisors (223880443).

671856200441 is a wasteful number, since it uses less digits than its factorization.

671856200441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223880442.

The product of its (nonzero) digits is 322560, while the sum is 44.

It can be divided in two parts, 67185 and 6200441, that added together give a palindrome (6267626).

The spelling of 671856200441 in words is "six hundred seventy-one billion, eight hundred fifty-six million, two hundred thousand, four hundred forty-one".