666305442478 has 8 divisors (see below), whose sum is σ = 1076339560968. Its totient is φ = 307525588824.

The previous prime is 666305442463. The next prime is 666305442503. The reversal of 666305442478 is 874244503666.

666305442478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12813566176 + ... + 12813566227.

It is an arithmetic number, because the mean of its divisors is an integer number (134542445121).

Almost surely, 2^666305442478 is an apocalyptic number.

666305442478 is a deficient number, since it is larger than the sum of its proper divisors (410034118490).

666305442478 is a wasteful number, since it uses less digits than its factorization.

666305442478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25627132418.

The product of its (nonzero) digits is 23224320, while the sum is 55.

The spelling of 666305442478 in words is "six hundred sixty-six billion, three hundred five million, four hundred forty-two thousand, four hundred seventy-eight".