671333673781 has 8 divisors (see below), whose sum is σ = 672505473024. Its totient is φ = 670162092240.

The previous prime is 671333673779. The next prime is 671333673797. The reversal of 671333673781 is 187376333176.

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 671333673781 - 2¹ = 671333673779 is a prime.

It is a super-2 number, since 2×671333673781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671333671781) 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, 6885351 + ... + 6982171.

It is an arithmetic number, because the mean of its divisors is an integer number (84063184128).

Almost surely, 2^671333673781 is an apocalyptic number.

It is an amenable number.

671333673781 is a deficient number, since it is larger than the sum of its proper divisors (1171799243).

671333673781 is a wasteful number, since it uses less digits than its factorization.

671333673781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108851.

The product of its digits is 8001504, while the sum is 55.

The spelling of 671333673781 in words is "six hundred seventy-one billion, three hundred thirty-three million, six hundred seventy-three thousand, seven hundred eighty-one".