671608687408 has 20 divisors (see below), whose sum is σ = 1343217375808. Its totient is φ = 324971945280.

The previous prime is 671608687381. The next prime is 671608687447. The reversal of 671608687408 is 804786806176.

671608687408 is an admirable number.

It is an unprimeable number.

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, 677024391 + ... + 677025382.

Almost surely, 2^671608687408 is an apocalyptic number.

It is an amenable number.

671608687408 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671608687408 is a wasteful number, since it uses less digits than its factorization.

671608687408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354049812 (or 1354049806 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 61.

The spelling of 671608687408 in words is "six hundred seventy-one billion, six hundred eight million, six hundred eighty-seven thousand, four hundred eight".