671958863 has 4 divisors (see below), whose sum is σ = 674438688. Its totient is φ = 669479040.

The previous prime is 671958853. The next prime is 671958899. The reversal of 671958863 is 368859176.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671958863 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 (671958803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1239506 + ... + 1240047.

It is an arithmetic number, because the mean of its divisors is an integer number (168609672).

Almost surely, 2^671958863 is an apocalyptic number.

671958863 is a deficient number, since it is larger than the sum of its proper divisors (2479825).

671958863 is a wasteful number, since it uses less digits than its factorization.

671958863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479824.

The product of its digits is 2177280, while the sum is 53.

The square root of 671958863 is about 25922.1693343748. The cubic root of 671958863 is about 875.8859545693.

The spelling of 671958863 in words is "six hundred seventy-one million, nine hundred fifty-eight thousand, eight hundred sixty-three".