6649322765 has 8 divisors (see below), whose sum is σ = 7992467448. Its totient is φ = 5310604800.

The previous prime is 6649322689. The next prime is 6649322767. The reversal of 6649322765 is 5672239466.

It can be written as a sum of positive squares in 4 ways, for example, as 281601961 + 6367720804 = 16781^2 + 79798^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6649322765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649322767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1103372 + ... + 1109381.

It is an arithmetic number, because the mean of its divisors is an integer number (999058431).

Almost surely, 2^6649322765 is an apocalyptic number.

It is an amenable number.

6649322765 is a deficient number, since it is larger than the sum of its proper divisors (1343144683).

6649322765 is a wasteful number, since it uses less digits than its factorization.

6649322765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213359.

The product of its digits is 3265920, while the sum is 50.

The square root of 6649322765 is about 81543.3796515695. The cubic root of 6649322765 is about 1880.4385167083.

The spelling of 6649322765 in words is "six billion, six hundred forty-nine million, three hundred twenty-two thousand, seven hundred sixty-five".