6611640251 has 2 divisors, whose sum is σ = 6611640252. Its totient is φ = 6611640250.

The previous prime is 6611640229. The next prime is 6611640293. The reversal of 6611640251 is 1520461166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6611640251 - 2¹⁰ = 6611639227 is a prime.

It is not a weakly prime, because it can be changed into another prime (6611640551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305820125 + 3305820126.

It is an arithmetic number, because the mean of its divisors is an integer number (3305820126).

Almost surely, 2^6611640251 is an apocalyptic number.

6611640251 is a deficient number, since it is larger than the sum of its proper divisors (1).

6611640251 is an equidigital number, since it uses as much as digits as its factorization.

6611640251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 6611640251 is about 81311.9932789745. The cubic root of 6611640251 is about 1876.8795612576.

The spelling of 6611640251 in words is "six billion, six hundred eleven million, six hundred forty thousand, two hundred fifty-one".