666666242240 has 56 divisors (see below), whose sum is σ = 1671051582960. Its totient is φ = 252631415808.

The previous prime is 666666242201. The next prime is 666666242261. The reversal of 666666242240 is 42242666666.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 54818447 + ... + 54830606.

Almost surely, 2^666666242240 is an apocalyptic number.

It is an amenable number.

666666242240 is an abundant number, since it is smaller than the sum of its proper divisors (1004385340720).

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

666666242240 is a wasteful number, since it uses less digits than its factorization.

666666242240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109649089 (or 109649079 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 50.

The spelling of 666666242240 in words is "six hundred sixty-six billion, six hundred sixty-six million, two hundred forty-two thousand, two hundred forty".