6647430749 has 2 divisors, whose sum is σ = 6647430750. Its totient is φ = 6647430748.

The previous prime is 6647430733. The next prime is 6647430793. The reversal of 6647430749 is 9470347466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6610828249 + 36602500 = 81307^2 + 6050^2 .

It is a cyclic number.

It is not a de Polignac number, because 6647430749 - 2⁴ = 6647430733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6647430697 and 6647430706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647490749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323715374 + 3323715375.

It is an arithmetic number, because the mean of its divisors is an integer number (3323715375).

Almost surely, 2^6647430749 is an apocalyptic number.

It is an amenable number.

6647430749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647430749 is an equidigital number, since it uses as much as digits as its factorization.

6647430749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 50.

The square root of 6647430749 is about 81531.7775410300. Note that the first 3 decimals coincide. The cubic root of 6647430749 is about 1880.2601447953.

The spelling of 6647430749 in words is "six billion, six hundred forty-seven million, four hundred thirty thousand, seven hundred forty-nine".