2666021091 has 32 divisors (see below), whose sum is σ = 3690316800. Its totient is φ = 1711041024.

The previous prime is 2666021047. The next prime is 2666021117. The reversal of 2666021091 is 1901206662.

It is not a de Polignac number, because 2666021091 - 2⁹ = 2666020579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2666021191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2373456 + ... + 2374578.

It is an arithmetic number, because the mean of its divisors is an integer number (115322400).

Almost surely, 2^2666021091 is an apocalyptic number.

2666021091 is a deficient number, since it is larger than the sum of its proper divisors (1024295709).

2666021091 is a wasteful number, since it uses less digits than its factorization.

2666021091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 2666021091 is about 51633.5268115592. The cubic root of 2666021091 is about 1386.6106353780.

The spelling of 2666021091 in words is "two billion, six hundred sixty-six million, twenty-one thousand, ninety-one".