6649693690 has 36 divisors (see below), whose sum is σ = 12132700398. Its totient is φ = 2624085120.

The previous prime is 6649693669. The next prime is 6649693693. The reversal of 6649693690 is 963969466.

It can be written as a sum of positive squares in 3 ways, for example, as 6388645041 + 261048649 = 79929^2 + 16157^2 .

It is a super-2 number, since 2×6649693690² = 88436852341651632200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6649693693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 27591970 + ... + 27592210.

Almost surely, 2^6649693690 is an apocalyptic number.

6649693690 is a deficient number, since it is larger than the sum of its proper divisors (5483006708).

6649693690 is an equidigital number, since it uses as much as digits as its factorization.

6649693690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 58.

The square root of 6649693690 is about 81545.6540227620. The cubic root of 6649693690 is about 1880.4734821081.

The spelling of 6649693690 in words is "six billion, six hundred forty-nine million, six hundred ninety-three thousand, six hundred ninety".