671216505 has 16 divisors (see below), whose sum is σ = 1074787584. Its totient is φ = 357701760.

The previous prime is 671216503. The next prime is 671216549. The reversal of 671216505 is 505612176.

It is not a de Polignac number, because 671216505 - 2¹ = 671216503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671216501) 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, 3045 + ... + 36765.

It is an arithmetic number, because the mean of its divisors is an integer number (67174224).

Almost surely, 2^671216505 is an apocalyptic number.

It is an amenable number.

671216505 is a deficient number, since it is larger than the sum of its proper divisors (403571079).

671216505 is a wasteful number, since it uses less digits than its factorization.

671216505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35056.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 671216505 is about 25907.8463983404. The cubic root of 671216505 is about 875.5632857395.

The spelling of 671216505 in words is "six hundred seventy-one million, two hundred sixteen thousand, five hundred five".