671307664464421 has 4 divisors (see below), whose sum is σ = 671307741557152. Its totient is φ = 671307587371692.

The previous prime is 671307664464419. The next prime is 671307664464449. The reversal of 671307664464421 is 124464466703176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 671307664464421 - 2¹ = 671307664464419 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 671307664464421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671307664464121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23536371 + ... + 43549696.

It is an arithmetic number, because the mean of its divisors is an integer number (167826935389288).

Almost surely, 2^{671307664464421} is an apocalyptic number.

It is an amenable number.

671307664464421 is a deficient number, since it is larger than the sum of its proper divisors (77092731).

671307664464421 is a wasteful number, since it uses less digits than its factorization.

671307664464421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77092730.

The product of its (nonzero) digits is 97542144, while the sum is 61.

The spelling of 671307664464421 in words is "six hundred seventy-one trillion, three hundred seven billion, six hundred sixty-four million, four hundred sixty-four thousand, four hundred twenty-one".