671606044218 has 16 divisors (see below), whose sum is σ = 1492457876160. Its totient is φ = 223868681388.

The previous prime is 671606044217. The next prime is 671606044237. The reversal of 671606044218 is 812440606176.

671606044218 is a `hidden beast` number, since 6 + 7 + 16 + 0 + 604 + 4 + 21 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671606044217) 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, 6218574430 + ... + 6218574537.

It is an arithmetic number, because the mean of its divisors is an integer number (93278617260).

Almost surely, 2^671606044218 is an apocalyptic number.

671606044218 is an abundant number, since it is smaller than the sum of its proper divisors (820851831942).

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

671606044218 is a wasteful number, since it uses less digits than its factorization.

671606044218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12437148978 (or 12437148972 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 671606044218 in words is "six hundred seventy-one billion, six hundred six million, forty-four thousand, two hundred eighteen".