2666996663 has 4 divisors (see below), whose sum is σ = 2667155568. Its totient is φ = 2666837760.

The previous prime is 2666996653. The next prime is 2666996711. The reversal of 2666996663 is 3666996662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2666996663 - 2²⁴ = 2650219447 is a prime.

It is a super-2 number, since 2×2666996663² = 14225742400906271138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666996653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50843 + ... + 88988.

It is an arithmetic number, because the mean of its divisors is an integer number (666788892).

Almost surely, 2^2666996663 is an apocalyptic number.

2666996663 is a deficient number, since it is larger than the sum of its proper divisors (158905).

2666996663 is a wasteful number, since it uses less digits than its factorization.

2666996663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158904.

The product of its digits is 22674816, while the sum is 59.

The square root of 2666996663 is about 51642.9730263470. The cubic root of 2666996663 is about 1386.7797480114.

Subtracting 2666996663 from its reverse (3666996662), we obtain a palindrome (999999999).

The spelling of 2666996663 in words is "two billion, six hundred sixty-six million, nine hundred ninety-six thousand, six hundred sixty-three".