2764881666 has 96 divisors (see below), whose sum is σ = 6462404208. Its totient is φ = 851251200.

The previous prime is 2764881631. The next prime is 2764881671. The reversal of 2764881666 is 6661884672.

It can be written as a sum of positive squares in 8 ways, for example, as 2259576225 + 505305441 = 47535^2 + 22479^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4233796 + ... + 4234448.

Almost surely, 2^2764881666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2764881666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3231202104).

2764881666 is an abundant number, since it is smaller than the sum of its proper divisors (3697522542).

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

2764881666 is a wasteful number, since it uses less digits than its factorization.

2764881666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 913 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 2764881666 is about 52582.1420826501. The cubic root of 2764881666 is about 1403.5423332358.

The spelling of 2764881666 in words is "two billion, seven hundred sixty-four million, eight hundred eighty-one thousand, six hundred sixty-six".