671631556 has 24 divisors (see below), whose sum is σ = 1234296000. Its totient is φ = 319162272.

The previous prime is 671631553. The next prime is 671631559. The reversal of 671631556 is 655136176.

It is an interprime number because it is at equal distance from previous prime (671631553) and next prime (671631559).

It is a super-2 number, since 2×671631556² = 902177894029962272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671631553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8806 + ... + 37693.

It is an arithmetic number, because the mean of its divisors is an integer number (51429000).

Almost surely, 2^671631556 is an apocalyptic number.

It is an amenable number.

671631556 is a deficient number, since it is larger than the sum of its proper divisors (562664444).

671631556 is a wasteful number, since it uses less digits than its factorization.

671631556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46683 (or 46681 counting only the distinct ones).

The product of its digits is 113400, while the sum is 40.

The square root of 671631556 is about 25915.8553013401. The cubic root of 671631556 is about 875.7437185983.

The spelling of 671631556 in words is "six hundred seventy-one million, six hundred thirty-one thousand, five hundred fifty-six".