666447525744666 has 32 divisors (see below), whose sum is σ = 1376163637094400. Its totient is φ = 214940577345840.

The previous prime is 666447525744659. The next prime is 666447525744667.

666447525744666 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666447525744591 and 666447525744600.

It is not an unprimeable number, because it can be changed into a prime (666447525744667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353185456 + ... + 355067403.

It is an arithmetic number, because the mean of its divisors is an integer number (43005113659200).

Almost surely, 2^{666447525744666} is an apocalyptic number.

666447525744666 is an abundant number, since it is smaller than the sum of its proper divisors (709716111349734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666447525744666 is a wasteful number, since it uses less digits than its factorization.

666447525744666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708257954.

The product of its digits is 29262643200, while the sum is 78.

The spelling of 666447525744666 in words is "six hundred sixty-six trillion, four hundred forty-seven billion, five hundred twenty-five million, seven hundred forty-four thousand, six hundred sixty-six".