671566816 has 24 divisors (see below), whose sum is σ = 1347096744. Its totient is φ = 329447040.

The previous prime is 671566787. The next prime is 671566823. The reversal of 671566816 is 618665176.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196290 + ... + 199681.

It is an arithmetic number, because the mean of its divisors is an integer number (56129031).

Almost surely, 2^671566816 is an apocalyptic number.

It is an amenable number.

671566816 is an abundant number, since it is smaller than the sum of its proper divisors (675529928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671566816 is a wasteful number, since it uses less digits than its factorization.

671566816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396034 (or 396026 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 671566816 is about 25914.6062289204. The cubic root of 671566816 is about 875.7155794251.

The spelling of 671566816 in words is "six hundred seventy-one million, five hundred sixty-six thousand, eight hundred sixteen".