666026489827 has 4 divisors (see below), whose sum is σ = 666034800520. Its totient is φ = 666018179136.

The previous prime is 666026489773. The next prime is 666026489831. The reversal of 666026489827 is 728984620666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666026489827 - 2¹¹ = 666026487779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666026489857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4033953 + ... + 4195810.

It is an arithmetic number, because the mean of its divisors is an integer number (166508700130).

Almost surely, 2^666026489827 is an apocalyptic number.

666026489827 is a deficient number, since it is larger than the sum of its proper divisors (8310693).

666026489827 is an equidigital number, since it uses as much as digits as its factorization.

666026489827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8310692.

The product of its (nonzero) digits is 83607552, while the sum is 64.

The spelling of 666026489827 in words is "six hundred sixty-six billion, twenty-six million, four hundred eighty-nine thousand, eight hundred twenty-seven".