671565973 has 4 divisors (see below), whose sum is σ = 723224908. Its totient is φ = 619907040.

The previous prime is 671565971. The next prime is 671566009. The reversal of 671565973 is 379565176.

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 212663889 + 458902084 = 14583^2 + 21422^2 .

It is a cyclic number.

It is not a de Polignac number, because 671565973 - 2¹ = 671565971 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671565971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25829448 + ... + 25829473.

It is an arithmetic number, because the mean of its divisors is an integer number (180806227).

Almost surely, 2^671565973 is an apocalyptic number.

It is an amenable number.

671565973 is a deficient number, since it is larger than the sum of its proper divisors (51658935).

671565973 is a wasteful number, since it uses less digits than its factorization.

671565973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51658934.

The product of its digits is 1190700, while the sum is 49.

The square root of 671565973 is about 25914.5899639566. The cubic root of 671565973 is about 875.7152130041.

The spelling of 671565973 in words is "six hundred seventy-one million, five hundred sixty-five thousand, nine hundred seventy-three".