2168081307 has 24 divisors (see below), whose sum is σ = 3605193696. Its totient is φ = 1229855616.

The previous prime is 2168081291. The next prime is 2168081329. The reversal of 2168081307 is 7031808612.

It is not a de Polignac number, because 2168081307 - 2⁴ = 2168081291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2168081387) 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, 116968 + ... + 134229.

It is an arithmetic number, because the mean of its divisors is an integer number (150216404).

Almost surely, 2^2168081307 is an apocalyptic number.

2168081307 is a deficient number, since it is larger than the sum of its proper divisors (1437112389).

2168081307 is a wasteful number, since it uses less digits than its factorization.

2168081307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251347 (or 251344 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 2168081307 is about 46562.6600077788. The cubic root of 2168081307 is about 1294.2709047668.

Adding to 2168081307 its reverse (7031808612), we get a palindrome (9199889919).

The spelling of 2168081307 in words is "two billion, one hundred sixty-eight million, eighty-one thousand, three hundred seven".