6781340669 has 4 divisors (see below), whose sum is σ = 6830839644. Its totient is φ = 6731841696.

The previous prime is 6781340633. The next prime is 6781340729. The reversal of 6781340669 is 9660431876.

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 5113680100 + 1667660569 = 71510^2 + 40837^2 .

It is a cyclic number.

It is not a de Polignac number, because 6781340669 - 2¹⁶ = 6781275133 is a prime.

It is a super-2 number, since 2×6781340669² = 91973162538066735122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781340609) 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, 24749282 + ... + 24749555.

It is an arithmetic number, because the mean of its divisors is an integer number (1707709911).

Almost surely, 2^6781340669 is an apocalyptic number.

It is an amenable number.

6781340669 is a deficient number, since it is larger than the sum of its proper divisors (49498975).

6781340669 is a wasteful number, since it uses less digits than its factorization.

6781340669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49498974.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 6781340669 is about 82348.8959792419. The cubic root of 6781340669 is about 1892.8020054032.

The spelling of 6781340669 in words is "six billion, seven hundred eighty-one million, three hundred forty thousand, six hundred sixty-nine".