6647713049 has 4 divisors (see below), whose sum is σ = 6655507236. Its totient is φ = 6639918864.

The previous prime is 6647713043. The next prime is 6647713057. The reversal of 6647713049 is 9403177466.

It is a happy number.

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 2555808025 + 4091905024 = 50555^2 + 63968^2 .

It is a cyclic number.

It is not a de Polignac number, because 6647713049 - 2¹² = 6647708953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6647712994 and 6647713012.

It is not an unprimeable number, because it can be changed into a prime (6647713043) 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, 3895814 + ... + 3897519.

It is an arithmetic number, because the mean of its divisors is an integer number (1663876809).

Almost surely, 2^6647713049 is an apocalyptic number.

It is an amenable number.

6647713049 is a deficient number, since it is larger than the sum of its proper divisors (7794187).

6647713049 is an equidigital number, since it uses as much as digits as its factorization.

6647713049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7794186.

The product of its (nonzero) digits is 762048, while the sum is 47.

The square root of 6647713049 is about 81533.5087494706. The cubic root of 6647713049 is about 1880.2867610899.

The spelling of 6647713049 in words is "six billion, six hundred forty-seven million, seven hundred thirteen thousand, forty-nine".