6766642691 has 16 divisors (see below), whose sum is σ = 7251404160. Its totient is φ = 6295760640.

The previous prime is 6766642661. The next prime is 6766642697. The reversal of 6766642691 is 1962466676.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6766642691 - 2¹⁰ = 6766641667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6766642697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227420 + ... + 255446.

It is an arithmetic number, because the mean of its divisors is an integer number (453212760).

Almost surely, 2^6766642691 is an apocalyptic number.

6766642691 is a deficient number, since it is larger than the sum of its proper divisors (484761469).

6766642691 is a wasteful number, since it uses less digits than its factorization.

6766642691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28274.

The product of its digits is 3919104, while the sum is 53.

The square root of 6766642691 is about 82259.6054634351. The cubic root of 6766642691 is about 1891.4335205538.

The spelling of 6766642691 in words is "six billion, seven hundred sixty-six million, six hundred forty-two thousand, six hundred ninety-one".