671646393441 has 12 divisors (see below), whose sum is σ = 970286063760. Its totient is φ = 447704187480.

The previous prime is 671646393437. The next prime is 671646393449. The reversal of 671646393441 is 144393646176.

671646393441 is a `hidden beast` number, since 6 + 7 + 164 + 6 + 39 + 3 + 441 = 666.

It is not a de Polignac number, because 671646393441 - 2² = 671646393437 is a prime.

It is a super-2 number, since 2×671646393441² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671646393449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4935375 + ... + 5069636.

It is an arithmetic number, because the mean of its divisors is an integer number (80857171980).

Almost surely, 2^671646393441 is an apocalyptic number.

It is an amenable number.

671646393441 is a deficient number, since it is larger than the sum of its proper divisors (298639670319).

671646393441 is a wasteful number, since it uses less digits than its factorization.

671646393441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10012476 (or 10012473 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 54.

The spelling of 671646393441 in words is "six hundred seventy-one billion, six hundred forty-six million, three hundred ninety-three thousand, four hundred forty-one".