671622216808 has 16 divisors (see below), whose sum is σ = 1333367636580. Its totient is φ = 316057513728.

The previous prime is 671622216703. The next prime is 671622216817. The reversal of 671622216808 is 808612226176.

It can be written as a sum of positive squares in 2 ways, for example, as 656680088164 + 14942128644 = 810358^2 + 122238^2 .

It is a super-2 number, since 2×671622216808² (a number of 24 digits) contains 22 as substring.

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, 2469199191 + ... + 2469199462.

Almost surely, 2^671622216808 is an apocalyptic number.

671622216808 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

671622216808 is a deficient number, since it is larger than the sum of its proper divisors (661745419772).

671622216808 is a wasteful number, since it uses less digits than its factorization.

671622216808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938398676 (or 4938398672 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 671622216808 in words is "six hundred seventy-one billion, six hundred twenty-two million, two hundred sixteen thousand, eight hundred eight".