6747749221 has 2 divisors, whose sum is σ = 6747749222. Its totient is φ = 6747749220.

The previous prime is 6747749147. The next prime is 6747749227. The reversal of 6747749221 is 1229477476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6726460225 + 21288996 = 82015^2 + 4614^2 .

It is a cyclic number.

It is not a de Polignac number, because 6747749221 - 2⁷ = 6747749093 is a prime.

It is a super-2 number, since 2×6747749221² = 91064239099012213682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6747749227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3373874610 + 3373874611.

It is an arithmetic number, because the mean of its divisors is an integer number (3373874611).

Almost surely, 2^6747749221 is an apocalyptic number.

It is an amenable number.

6747749221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6747749221 is an equidigital number, since it uses as much as digits as its factorization.

6747749221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 49.

The square root of 6747749221 is about 82144.6846789249. The cubic root of 6747749221 is about 1889.6714919462.

The spelling of 6747749221 in words is "six billion, seven hundred forty-seven million, seven hundred forty-nine thousand, two hundred twenty-one".