671816485 has 8 divisors (see below), whose sum is σ = 819396216. Its totient is φ = 528642240.

The previous prime is 671816479. The next prime is 671816491. The reversal of 671816485 is 584618176.

It is an interprime number because it is at equal distance from previous prime (671816479) and next prime (671816491).

It can be written as a sum of positive squares in 4 ways, for example, as 18809569 + 653006916 = 4337^2 + 25554^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-671816485 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1101034 + ... + 1101643.

It is an arithmetic number, because the mean of its divisors is an integer number (102424527).

Almost surely, 2^671816485 is an apocalyptic number.

It is an amenable number.

671816485 is a deficient number, since it is larger than the sum of its proper divisors (147579731).

671816485 is a wasteful number, since it uses less digits than its factorization.

671816485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202743.

The product of its digits is 322560, while the sum is 46.

The square root of 671816485 is about 25919.4229295330. The cubic root of 671816485 is about 875.8240878360.

The spelling of 671816485 in words is "six hundred seventy-one million, eight hundred sixteen thousand, four hundred eighty-five".