2991278168 has 32 divisors (see below), whose sum is σ = 5686254000. Its totient is φ = 1475008128.

The previous prime is 2991278159. The next prime is 2991278177. The reversal of 2991278168 is 8618721992.

It is an interprime number because it is at equal distance from previous prime (2991278159) and next prime (2991278177).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403358 + ... + 410706.

Almost surely, 2^2991278168 is an apocalyptic number.

It is an amenable number.

2991278168 is a deficient number, since it is larger than the sum of its proper divisors (2694975832).

2991278168 is a wasteful number, since it uses less digits than its factorization.

2991278168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8051 (or 8047 counting only the distinct ones).

The product of its digits is 870912, while the sum is 53.

The square root of 2991278168 is about 54692.5787287453. The cubic root of 2991278168 is about 1440.8505404794.

The spelling of 2991278168 in words is "two billion, nine hundred ninety-one million, two hundred seventy-eight thousand, one hundred sixty-eight".