6613297749 has 12 divisors (see below), whose sum is σ = 9810718476. Its totient is φ = 4289706432.

The previous prime is 6613297741. The next prime is 6613297807. The reversal of 6613297749 is 9477923166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5958296100 + 655001649 = 77190^2 + 25593^2 .

It is not a de Polignac number, because 6613297749 - 2³ = 6613297741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6613297695 and 6613297704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6613297741) 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 in 11 ways as a sum of consecutive naturals, for example, 9929544 + ... + 9930209.

It is an arithmetic number, because the mean of its divisors is an integer number (817559873).

Almost surely, 2^6613297749 is an apocalyptic number.

It is an amenable number.

6613297749 is a deficient number, since it is larger than the sum of its proper divisors (3197420727).

6613297749 is a wasteful number, since it uses less digits than its factorization.

6613297749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19859796 (or 19859793 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 6613297749 is about 81322.1848513676. The cubic root of 6613297749 is about 1877.0363889168.

The spelling of 6613297749 in words is "six billion, six hundred thirteen million, two hundred ninety-seven thousand, seven hundred forty-nine".