2666691879 has 16 divisors (see below), whose sum is σ = 3578370048. Its totient is φ = 1766428832.

The previous prime is 2666691871. The next prime is 2666691883. The reversal of 2666691879 is 9781966662.

It is a cyclic number.

It is not a de Polignac number, because 2666691879 - 2³ = 2666691871 is a prime.

It is a super-3 number, since 3×2666691879³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666691871) 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, 521674 + ... + 526760.

It is an arithmetic number, because the mean of its divisors is an integer number (223648128).

Almost surely, 2^2666691879 is an apocalyptic number.

2666691879 is a deficient number, since it is larger than the sum of its proper divisors (911678169).

2666691879 is a wasteful number, since it uses less digits than its factorization.

2666691879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174.

The product of its digits is 11757312, while the sum is 60.

The square root of 2666691879 is about 51640.0220662230. The cubic root of 2666691879 is about 1386.7269190014.

The spelling of 2666691879 in words is "two billion, six hundred sixty-six million, six hundred ninety-one thousand, eight hundred seventy-nine".