6649360613 has 60 divisors (see below), whose sum is σ = 8343674820. Its totient is φ = 5294032128.

The previous prime is 6649360609. The next prime is 6649360621. The reversal of 6649360613 is 3160639466.

It can be written as a sum of positive squares in 6 ways, for example, as 49098049 + 6600262564 = 7007^2 + 81242^2 .

It is not a de Polignac number, because 6649360613 - 2² = 6649360609 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 (6649360633) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 74711873 + ... + 74711961.

It is an arithmetic number, because the mean of its divisors is an integer number (139061247).

Almost surely, 2^6649360613 is an apocalyptic number.

It is an amenable number.

6649360613 is a deficient number, since it is larger than the sum of its proper divisors (1694314207).

6649360613 is an frugal number, since it uses more digits than its factorization.

6649360613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 44.

The square root of 6649360613 is about 81543.6117240339. The cubic root of 6649360613 is about 1880.4420845253.

The spelling of 6649360613 in words is "six billion, six hundred forty-nine million, three hundred sixty thousand, six hundred thirteen".