2668139999 has 16 divisors (see below), whose sum is σ = 3253774080. Its totient is φ = 2136922560.

The previous prime is 2668139921. The next prime is 2668140019. The reversal of 2668139999 is 9999318662.

It is a cyclic number.

It is not a de Polignac number, because 2668139999 - 2¹⁶ = 2668074463 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 (2668139399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127697 + ... + 147114.

It is an arithmetic number, because the mean of its divisors is an integer number (203360880).

Almost surely, 2^2668139999 is an apocalyptic number.

2668139999 is a deficient number, since it is larger than the sum of its proper divisors (585634081).

2668139999 is a wasteful number, since it uses less digits than its factorization.

2668139999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274910.

The product of its digits is 11337408, while the sum is 62.

The square root of 2668139999 is about 51654.0414585345. The cubic root of 2668139999 is about 1386.9778895778.

The spelling of 2668139999 in words is "two billion, six hundred sixty-eight million, one hundred thirty-nine thousand, nine hundred ninety-nine".