666441261815835 has 32 divisors (see below), whose sum is σ = 1171049929286400. Its totient is φ = 320954425040000.

The previous prime is 666441261815783. The next prime is 666441261815837. The reversal of 666441261815835 is 538518162144666.

It is not a de Polignac number, because 666441261815835 - 2⁸ = 666441261815579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666441261815837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13553794041 + ... + 13553843210.

It is an arithmetic number, because the mean of its divisors is an integer number (36595310290200).

Almost surely, 2^{666441261815835} is an apocalyptic number.

666441261815835 is a deficient number, since it is larger than the sum of its proper divisors (504608667470565).

666441261815835 is a wasteful number, since it uses less digits than its factorization.

666441261815835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27107637419.

The product of its digits is 199065600, while the sum is 66.

The spelling of 666441261815835 in words is "six hundred sixty-six trillion, four hundred forty-one billion, two hundred sixty-one million, eight hundred fifteen thousand, eight hundred thirty-five".