671567005 has 4 divisors (see below), whose sum is σ = 805880412. Its totient is φ = 537253600.

The previous prime is 671566993. The next prime is 671567051. The reversal of 671567005 is 500765176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 388957284 + 282609721 = 19722^2 + 16811^2 .

It is a de Polignac number, because none of the positive numbers 2^k-671567005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67156696 + ... + 67156705.

It is an arithmetic number, because the mean of its divisors is an integer number (201470103).

Almost surely, 2^671567005 is an apocalyptic number.

It is an amenable number.

671567005 is a deficient number, since it is larger than the sum of its proper divisors (134313407).

671567005 is a wasteful number, since it uses less digits than its factorization.

671567005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134313406.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 671567005 is about 25914.6098755123. The cubic root of 671567005 is about 875.7156615764.

The spelling of 671567005 in words is "six hundred seventy-one million, five hundred sixty-seven thousand, five".