6766813665 has 24 divisors (see below), whose sum is σ = 11777831208. Its totient is φ = 3593986560.

The previous prime is 6766813661. The next prime is 6766813681. The reversal of 6766813665 is 5663186676.

It can be written as a sum of positive squares in 4 ways, for example, as 37564641 + 6729249024 = 6129^2 + 82032^2 .

It is not a de Polignac number, because 6766813665 - 2² = 6766813661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6766813661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 301134 + ... + 322823.

It is an arithmetic number, because the mean of its divisors is an integer number (490742967).

Almost surely, 2^6766813665 is an apocalyptic number.

It is an amenable number.

6766813665 is a deficient number, since it is larger than the sum of its proper divisors (5011017543).

6766813665 is a wasteful number, since it uses less digits than its factorization.

6766813665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624209 (or 624206 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 6766813665 is about 82260.6446911280. The cubic root of 6766813665 is about 1891.4494508187.

The spelling of 6766813665 in words is "six billion, seven hundred sixty-six million, eight hundred thirteen thousand, six hundred sixty-five".