666043644455403 has 16 divisors (see below), whose sum is σ = 897068081395200. Its totient is φ = 439531993418400.

The previous prime is 666043644455401. The next prime is 666043644455407. The reversal of 666043644455403 is 304554446340666.

It is not a de Polignac number, because 666043644455403 - 2¹ = 666043644455401 is a prime.

It is a super-2 number, since 2×666043644455403² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666043644455401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 979848273 + ... + 980527778.

It is an arithmetic number, because the mean of its divisors is an integer number (56066755087200).

Almost surely, 2^{666043644455403} is an apocalyptic number.

666043644455403 is a deficient number, since it is larger than the sum of its proper divisors (231024436939797).

666043644455403 is a wasteful number, since it uses less digits than its factorization.

666043644455403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1960377202.

The product of its (nonzero) digits is 298598400, while the sum is 60.

The spelling of 666043644455403 in words is "six hundred sixty-six trillion, forty-three billion, six hundred forty-four million, four hundred fifty-five thousand, four hundred three".