6747767221 has 8 divisors (see below), whose sum is σ = 7267859480. Its totient is φ = 6227822592.

The previous prime is 6747767207. The next prime is 6747767227. The reversal of 6747767221 is 1227677476.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 269288100 + 6478479121 = 16410^2 + 80489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6747767221 - 2¹¹ = 6747765173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6747767227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69385 + ... + 135313.

It is an arithmetic number, because the mean of its divisors is an integer number (908482435).

Almost surely, 2^6747767221 is an apocalyptic number.

It is an amenable number.

6747767221 is a deficient number, since it is larger than the sum of its proper divisors (520092259).

6747767221 is a wasteful number, since it uses less digits than its factorization.

6747767221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73815.

The product of its digits is 1382976, while the sum is 49.

The square root of 6747767221 is about 82144.7942416316. The cubic root of 6747767221 is about 1889.6731722130.

The spelling of 6747767221 in words is "six billion, seven hundred forty-seven million, seven hundred sixty-seven thousand, two hundred twenty-one".