671342668821 has 24 divisors (see below), whose sum is σ = 1057993244256. Its totient is φ = 406828211040.

The previous prime is 671342668819. The next prime is 671342668823. The reversal of 671342668821 is 128866243176.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (671342668819) and next prime (671342668823).

It is not a de Polignac number, because 671342668821 - 2¹ = 671342668819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671342668823) 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 23 ways as a sum of consecutive naturals, for example, 503391 + ... + 1263363.

It is an arithmetic number, because the mean of its divisors is an integer number (44083051844).

Almost surely, 2^671342668821 is an apocalyptic number.

It is an amenable number.

671342668821 is a deficient number, since it is larger than the sum of its proper divisors (386650575435).

671342668821 is a wasteful number, since it uses less digits than its factorization.

671342668821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768913 (or 768910 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 671342668821 in words is "six hundred seventy-one billion, three hundred forty-two million, six hundred sixty-eight thousand, eight hundred twenty-one".