671958861 has 16 divisors (see below), whose sum is σ = 1030224384. Its totient is φ = 381618864.

The previous prime is 671958853. The next prime is 671958899. The reversal of 671958861 is 168859176.

It is not a de Polignac number, because 671958861 - 2³ = 671958853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671956861) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 94731 + ... + 101576.

It is an arithmetic number, because the mean of its divisors is an integer number (64389024).

Almost surely, 2^671958861 is an apocalyptic number.

It is an amenable number.

671958861 is a deficient number, since it is larger than the sum of its proper divisors (358265523).

671958861 is a wasteful number, since it uses less digits than its factorization.

671958861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196480.

The product of its digits is 725760, while the sum is 51.

The square root of 671958861 is about 25922.1692957978. The cubic root of 671958861 is about 875.8859537003.

The spelling of 671958861 in words is "six hundred seventy-one million, nine hundred fifty-eight thousand, eight hundred sixty-one".