671671671 has 16 divisors (see below), whose sum is σ = 992995968. Its totient is φ = 400399200.

The previous prime is 671671657. The next prime is 671671687. The reversal of 671671671 is 176176176.

It is not a de Polignac number, because 671671671 - 2⁷ = 671671543 is a prime.

It is a super-2 number, since 2×671671671² = 902285667247864482, which contains 22 as substring.

671671671 is a modest number, since divided by 671671 gives 671 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671671621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164821 + ... + 168846.

It is an arithmetic number, because the mean of its divisors is an integer number (62062248).

Almost surely, 2^671671671 is an apocalyptic number.

671671671 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

671671671 is a deficient number, since it is larger than the sum of its proper divisors (321324297).

671671671 is a wasteful number, since it uses less digits than its factorization.

671671671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333742.

The product of its digits is 74088, while the sum is 42.

The square root of 671671671 is about 25916.6292368433. The cubic root of 671671671 is about 875.7611536338.

It can be divided in two parts, 6716 and 71671, that added together give a palindrome (78387).

The spelling of 671671671 in words is "six hundred seventy-one million, six hundred seventy-one thousand, six hundred seventy-one".