2666436665 has 32 divisors (see below), whose sum is σ = 3357573120. Its totient is φ = 2030825664.

The previous prime is 2666436637. The next prime is 2666436673. The reversal of 2666436665 is 5666346662.

It is a cyclic number.

It is not a de Polignac number, because 2666436665 - 2¹⁸ = 2666174521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3708176 + ... + 3708894.

It is an arithmetic number, because the mean of its divisors is an integer number (104924160).

Almost surely, 2^2666436665 is an apocalyptic number.

It is an amenable number.

2666436665 is a deficient number, since it is larger than the sum of its proper divisors (691136455).

2666436665 is a wasteful number, since it uses less digits than its factorization.

2666436665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181.

The product of its digits is 5598720, while the sum is 50.

The square root of 2666436665 is about 51637.5509198490. The cubic root of 2666436665 is about 1386.6826789928.

The spelling of 2666436665 in words is "two billion, six hundred sixty-six million, four hundred thirty-six thousand, six hundred sixty-five".