671991851167 has 48 divisors (see below), whose sum is σ = 869059445760. Its totient is φ = 508269879936.

The previous prime is 671991851147. The next prime is 671991851177. The reversal of 671991851167 is 761158199176.

It is not a de Polignac number, because 671991851167 - 2⁷ = 671991851039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671991851147) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2250309 + ... + 2531377.

It is an arithmetic number, because the mean of its divisors is an integer number (18105405120).

Almost surely, 2^671991851167 is an apocalyptic number.

671991851167 is a deficient number, since it is larger than the sum of its proper divisors (197067594593).

671991851167 is a wasteful number, since it uses less digits than its factorization.

671991851167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281192 (or 281179 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 61.

The spelling of 671991851167 in words is "six hundred seventy-one billion, nine hundred ninety-one million, eight hundred fifty-one thousand, one hundred sixty-seven".