2691108666 has 48 divisors (see below), whose sum is σ = 5898372480. Its totient is φ = 886688640.

The previous prime is 2691108631. The next prime is 2691108671. The reversal of 2691108666 is 6668011962.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 600751 + ... + 605213.

It is an arithmetic number, because the mean of its divisors is an integer number (122882760).

Almost surely, 2^2691108666 is an apocalyptic number.

2691108666 is an abundant number, since it is smaller than the sum of its proper divisors (3207263814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2691108666 is a wasteful number, since it uses less digits than its factorization.

2691108666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4851 (or 4848 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 2691108666 is about 51875.8967729715. The cubic root of 2691108666 is about 1390.9464537329.

The spelling of 2691108666 in words is "two billion, six hundred ninety-one million, one hundred eight thousand, six hundred sixty-six".