6661726867 has 2 divisors, whose sum is σ = 6661726868. Its totient is φ = 6661726866.

The previous prime is 6661726847. The next prime is 6661726873. The reversal of 6661726867 is 7686271666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6661726867 - 2¹⁵ = 6661694099 is a prime.

It is not a weakly prime, because it can be changed into another prime (6661726837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330863433 + 3330863434.

It is an arithmetic number, because the mean of its divisors is an integer number (3330863434).

Almost surely, 2^6661726867 is an apocalyptic number.

6661726867 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661726867 is an equidigital number, since it uses as much as digits as its factorization.

6661726867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 55.

The square root of 6661726867 is about 81619.4025155784. The cubic root of 6661726867 is about 1881.6070899546.

The spelling of 6661726867 in words is "six billion, six hundred sixty-one million, seven hundred twenty-six thousand, eight hundred sixty-seven".