671668649931 has 8 divisors (see below), whose sum is σ = 895606378704. Its totient is φ = 447755010560.

The previous prime is 671668649921. The next prime is 671668649987. The reversal of 671668649931 is 139946866176.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671668649931 - 2¹⁰ = 671668648907 is a prime.

It is a super-2 number, since 2×671668649931² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671668649921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5957190 + ... + 6068891.

It is an arithmetic number, because the mean of its divisors is an integer number (111950797338).

Almost surely, 2^671668649931 is an apocalyptic number.

671668649931 is a deficient number, since it is larger than the sum of its proper divisors (223937728773).

671668649931 is a wasteful number, since it uses less digits than its factorization.

671668649931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12044701.

The product of its digits is 70543872, while the sum is 66.

The spelling of 671668649931 in words is "six hundred seventy-one billion, six hundred sixty-eight million, six hundred forty-nine thousand, nine hundred thirty-one".