671655671 has 8 divisors (see below), whose sum is σ = 680744064. Its totient is φ = 662591160.

The previous prime is 671655659. The next prime is 671655679. The reversal of 671655671 is 176556176.

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 671655671 - 2¹⁰ = 671654647 is a prime.

It is a super-2 number, since 2×671655671² = 902242680772920482, which 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 (671655679) 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, 54776 + ... + 65906.

It is an arithmetic number, because the mean of its divisors is an integer number (85093008).

Almost surely, 2^671655671 is an apocalyptic number.

671655671 is a deficient number, since it is larger than the sum of its proper divisors (9088393).

671655671 is a wasteful number, since it uses less digits than its factorization.

671655671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11941.

The product of its digits is 264600, while the sum is 44.

The square root of 671655671 is about 25916.3205528871. The cubic root of 671655671 is about 875.7541996956.

The spelling of 671655671 in words is "six hundred seventy-one million, six hundred fifty-five thousand, six hundred seventy-one".