6749772649 has 9 divisors (see below), whose sum is σ = 6993017733. Its totient is φ = 6514721472.

The previous prime is 6749772643. The next prime is 6749772661. The reversal of 6749772649 is 9462779476.

The square root of 6749772649 is 82157.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 47403225 + 6702369424 = 6885^2 + 81868^2 .

It is not a de Polignac number, because 6749772649 - 2⁹ = 6749772137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6749772643) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2381137 + ... + 2383969.

Almost surely, 2^6749772649 is an apocalyptic number.

6749772649 is the 82157-th square number.

6749772649 is the 41079-th centered octagonal number.

It is an amenable number.

6749772649 is a deficient number, since it is larger than the sum of its proper divisors (243245084).

6749772649 is an frugal number, since it uses more digits than its factorization.

6749772649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724 (or 2862 counting only the distinct ones).

The product of its digits is 32006016, while the sum is 61.

The cubic root of 6749772649 is about 1889.8603565070.

The spelling of 6749772649 in words is "six billion, seven hundred forty-nine million, seven hundred seventy-two thousand, six hundred forty-nine".