671961983616 has 192 divisors, whose sum is σ = 2410773019200. Its totient is φ = 174535557120.

The previous prime is 671961983569. The next prime is 671961983633. The reversal of 671961983616 is 616389169176.

671961983616 is a `hidden beast` number, since 6 + 7 + 1 + 9 + 6 + 1 + 9 + 8 + 3 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3698961 + ... + 3876368.

It is an arithmetic number, because the mean of its divisors is an integer number (12556109475).

Almost surely, 2^671961983616 is an apocalyptic number.

671961983616 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

671961983616 is an abundant number, since it is smaller than the sum of its proper divisors (1738811035584).

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

671961983616 is a wasteful number, since it uses less digits than its factorization.

671961983616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7575367 (or 7575352 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The spelling of 671961983616 in words is "six hundred seventy-one billion, nine hundred sixty-one million, nine hundred eighty-three thousand, six hundred sixteen".