6647677749 has 16 divisors (see below), whose sum is σ = 9967070400. Its totient is φ = 4378388688.

The previous prime is 6647677747. The next prime is 6647677753. The reversal of 6647677749 is 9477767466.

It is not a de Polignac number, because 6647677749 - 2¹ = 6647677747 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647677747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1480954 + ... + 1485435.

It is an arithmetic number, because the mean of its divisors is an integer number (622941900).

Almost surely, 2^6647677749 is an apocalyptic number.

It is an amenable number.

6647677749 is a deficient number, since it is larger than the sum of its proper divisors (3319392651).

6647677749 is a wasteful number, since it uses less digits than its factorization.

6647677749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966481 (or 2966475 counting only the distinct ones).

The product of its digits is 74680704, while the sum is 63.

The square root of 6647677749 is about 81533.2922737700. The cubic root of 6647677749 is about 1880.2834329157.

The spelling of 6647677749 in words is "six billion, six hundred forty-seven million, six hundred seventy-seven thousand, seven hundred forty-nine".