666342424243668 has 24 divisors (see below), whose sum is σ = 1646257754014272. Its totient is φ = 209048603684224.

The previous prime is 666342424243649. The next prime is 666342424243711. The reversal of 666342424243668 is 866342424243666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 666342424243599 and 666342424243608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1633192216080 + ... + 1633192216487.

It is an arithmetic number, because the mean of its divisors is an integer number (68594073083928).

Almost surely, 2^{666342424243668} is an apocalyptic number.

666342424243668 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

666342424243668 is an abundant number, since it is smaller than the sum of its proper divisors (979915329770604).

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

666342424243668 is a wasteful number, since it uses less digits than its factorization.

666342424243668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266384432591 (or 3266384432589 counting only the distinct ones).

The product of its digits is 1146617856, while the sum is 66.

The spelling of 666342424243668 in words is "six hundred sixty-six trillion, three hundred forty-two billion, four hundred twenty-four million, two hundred forty-three thousand, six hundred sixty-eight".