671955556 has 12 divisors (see below), whose sum is σ = 1176592060. Its totient is φ = 335786400.

The previous prime is 671955551. The next prime is 671955563. The reversal of 671955556 is 655559176.

It can be written as a sum of positive squares in 2 ways, for example, as 546156900 + 125798656 = 23370^2 + 11216^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (671955551) 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, 39795 + ... + 54106.

Almost surely, 2^671955556 is an apocalyptic number.

It is an amenable number.

671955556 is a deficient number, since it is larger than the sum of its proper divisors (504636504).

671955556 is a wasteful number, since it uses less digits than its factorization.

671955556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95694 (or 95692 counting only the distinct ones).

The product of its digits is 1417500, while the sum is 49.

The square root of 671955556 is about 25922.1055471966. The cubic root of 671955556 is about 875.8845176958.

The spelling of 671955556 in words is "six hundred seventy-one million, nine hundred fifty-five thousand, five hundred fifty-six".