671813166663 has 24 divisors (see below), whose sum is σ = 1016650692096. Its totient is φ = 426958765200.

The previous prime is 671813166659. The next prime is 671813166677. The reversal of 671813166663 is 366661318176.

It is not a de Polignac number, because 671813166663 - 2² = 671813166659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671813166613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17950953 + ... + 17988338.

It is an arithmetic number, because the mean of its divisors is an integer number (42360445504).

Almost surely, 2^671813166663 is an apocalyptic number.

671813166663 is a deficient number, since it is larger than the sum of its proper divisors (344837525433).

671813166663 is a wasteful number, since it uses less digits than its factorization.

671813166663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35939395 (or 35939392 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 671813166663 in words is "six hundred seventy-one billion, eight hundred thirteen million, one hundred sixty-six thousand, six hundred sixty-three".