6766243395761 has 4 divisors (see below), whose sum is σ = 6779536605300. Its totient is φ = 6752950186224.

The previous prime is 6766243395713. The next prime is 6766243395803. The reversal of 6766243395761 is 1675933426676.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6115407514225 + 650835881536 = 2472935^2 + 806744^2 .

It is a cyclic number.

It is not a de Polignac number, because 6766243395761 - 2²² = 6766239201457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6766243395061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6646604006 + ... + 6646605023.

It is an arithmetic number, because the mean of its divisors is an integer number (1694884151325).

Almost surely, 2^{6766243395761} is an apocalyptic number.

It is an amenable number.

6766243395761 is a deficient number, since it is larger than the sum of its proper divisors (13293209539).

6766243395761 is a wasteful number, since it uses less digits than its factorization.

6766243395761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13293209538.

The product of its digits is 205752960, while the sum is 65.

The spelling of 6766243395761 in words is "six trillion, seven hundred sixty-six billion, two hundred forty-three million, three hundred ninety-five thousand, seven hundred sixty-one".