6774329781 has 20 divisors (see below), whose sum is σ = 10122110284. Its totient is φ = 4515134400.

The previous prime is 6774329753. The next prime is 6774329789. The reversal of 6774329781 is 1879234776.

It can be written as a sum of positive squares in 2 ways, for example, as 5171048100 + 1603281681 = 71910^2 + 40041^2 .

It is not a de Polignac number, because 6774329781 - 2¹⁴ = 6774313397 is a prime.

It is a super-2 number, since 2×6774329781² = 91783087963487015922, 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 (6774329789) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 469251 + ... + 483471.

Almost surely, 2^6774329781 is an apocalyptic number.

It is an amenable number.

6774329781 is a deficient number, since it is larger than the sum of its proper divisors (3347780503).

6774329781 is a wasteful number, since it uses less digits than its factorization.

6774329781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20114 (or 20105 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 6774329781 is about 82306.3167745951. The cubic root of 6774329781 is about 1892.1494894637.

The spelling of 6774329781 in words is "six billion, seven hundred seventy-four million, three hundred twenty-nine thousand, seven hundred eighty-one".