671563677 has 4 divisors (see below), whose sum is σ = 895418240. Its totient is φ = 447709116.

The previous prime is 671563667. The next prime is 671563679. The reversal of 671563677 is 776365176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 671563677 - 2¹¹ = 671561629 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 (671563679) 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, 111927277 + ... + 111927282.

It is an arithmetic number, because the mean of its divisors is an integer number (223854560).

Almost surely, 2^671563677 is an apocalyptic number.

It is an amenable number.

671563677 is a deficient number, since it is larger than the sum of its proper divisors (223854563).

671563677 is a wasteful number, since it uses less digits than its factorization.

671563677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223854562.

The product of its digits is 1111320, while the sum is 48.

The square root of 671563677 is about 25914.5456645491. The cubic root of 671563677 is about 875.7142150161.

The spelling of 671563677 in words is "six hundred seventy-one million, five hundred sixty-three thousand, six hundred seventy-seven".