2721661766 has 16 divisors (see below), whose sum is σ = 4187507280. Its totient is φ = 1326235680.

The previous prime is 2721661757. The next prime is 2721661807. The reversal of 2721661766 is 6671661272.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89036 + ... + 115631.

It is an arithmetic number, because the mean of its divisors is an integer number (261719205).

Almost surely, 2^2721661766 is an apocalyptic number.

2721661766 is a deficient number, since it is larger than the sum of its proper divisors (1465845514).

2721661766 is a wasteful number, since it uses less digits than its factorization.

2721661766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204839.

The product of its digits is 254016, while the sum is 44.

The square root of 2721661766 is about 52169.5482633308. The cubic root of 2721661766 is about 1396.1906247709.

The spelling of 2721661766 in words is "two billion, seven hundred twenty-one million, six hundred sixty-one thousand, seven hundred sixty-six".