671215611 has 16 divisors (see below), whose sum is σ = 990067968. Its totient is φ = 401066400.

The previous prime is 671215591. The next prime is 671215613. The reversal of 671215611 is 116512176.

It is not a de Polignac number, because 671215611 - 2⁶ = 671215547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671215613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140896 + ... + 145581.

It is an arithmetic number, because the mean of its divisors is an integer number (61879248).

Almost surely, 2^671215611 is an apocalyptic number.

671215611 is a deficient number, since it is larger than the sum of its proper divisors (318852357).

671215611 is a wasteful number, since it uses less digits than its factorization.

671215611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286562.

The product of its digits is 2520, while the sum is 30.

The square root of 671215611 is about 25907.8291448743. The cubic root of 671215611 is about 875.5628970155.

Adding to 671215611 its reverse (116512176), we get a palindrome (787727787).

The spelling of 671215611 in words is "six hundred seventy-one million, two hundred fifteen thousand, six hundred eleven".