2766331721 has 16 divisors (see below), whose sum is σ = 2885414400. Its totient is φ = 2648925888.

The previous prime is 2766331699. The next prime is 2766331727. The reversal of 2766331721 is 1271336672.

It is not a de Polignac number, because 2766331721 - 2¹⁸ = 2766069577 is a prime.

It is a super-2 number, since 2×2766331721² = 15305182381221643682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2766331727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2507456 + ... + 2508558.

It is an arithmetic number, because the mean of its divisors is an integer number (180338400).

Almost surely, 2^2766331721 is an apocalyptic number.

It is an amenable number.

2766331721 is a deficient number, since it is larger than the sum of its proper divisors (119082679).

2766331721 is a wasteful number, since it uses less digits than its factorization.

2766331721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768.

The product of its digits is 63504, while the sum is 38.

The square root of 2766331721 is about 52595.9287492863. The cubic root of 2766331721 is about 1403.7876551139.

The spelling of 2766331721 in words is "two billion, seven hundred sixty-six million, three hundred thirty-one thousand, seven hundred twenty-one".