6491649826 has 16 divisors (see below), whose sum is σ = 10081504440. Its totient is φ = 3131331840.

The previous prime is 6491649793. The next prime is 6491649859. The reversal of 6491649826 is 6289461946.

It is an interprime number because it is at equal distance from previous prime (6491649793) and next prime (6491649859).

It can be written as a sum of positive squares in 4 ways, for example, as 5024683225 + 1466966601 = 70885^2 + 38301^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 26506 + ... + 116986.

Almost surely, 2^6491649826 is an apocalyptic number.

6491649826 is a deficient number, since it is larger than the sum of its proper divisors (3589854614).

6491649826 is a wasteful number, since it uses less digits than its factorization.

6491649826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91749.

The product of its digits is 4478976, while the sum is 55.

The square root of 6491649826 is about 80570.7752600160. The cubic root of 6491649826 is about 1865.4560790920.

The spelling of 6491649826 in words is "six billion, four hundred ninety-one million, six hundred forty-nine thousand, eight hundred twenty-six".