2666266641 has 12 divisors (see below), whose sum is σ = 3984076980. Its totient is φ = 1716217440.

The previous prime is 2666266639. The next prime is 2666266649. The reversal of 2666266641 is 1466626662.

It can be written as a sum of positive squares in 2 ways, for example, as 456890625 + 2209376016 = 21375^2 + 47004^2 .

It is not a de Polignac number, because 2666266641 - 2¹ = 2666266639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2666266649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5107530 + ... + 5108051.

It is an arithmetic number, because the mean of its divisors is an integer number (332006415).

Almost surely, 2^2666266641 is an apocalyptic number.

It is an amenable number.

2666266641 is a deficient number, since it is larger than the sum of its proper divisors (1317810339).

2666266641 is a wasteful number, since it uses less digits than its factorization.

2666266641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10215616 (or 10215613 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 2666266641 is about 51635.9045723032. The cubic root of 2666266641 is about 1386.6532046572.

The spelling of 2666266641 in words is "two billion, six hundred sixty-six million, two hundred sixty-six thousand, six hundred forty-one".