666223366424642 has 8 divisors (see below), whose sum is σ = 1076206976532156. Its totient is φ = 307487707580592.

The previous prime is 666223366424639. The next prime is 666223366424663. The reversal of 666223366424642 is 246424663322666.

It can be written as a sum of positive squares in 2 ways, for example, as 515662392656401 + 150560973768241 = 22708201^2 + 12270329^2 .

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

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, 12811987815833 + ... + 12811987815884.

Almost surely, 2^{666223366424642} is an apocalyptic number.

666223366424642 is a deficient number, since it is larger than the sum of its proper divisors (409983610107514).

666223366424642 is a wasteful number, since it uses less digits than its factorization.

666223366424642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25623975631732.

The product of its digits is 429981696, while the sum is 62.

The spelling of 666223366424642 in words is "six hundred sixty-six trillion, two hundred twenty-three billion, three hundred sixty-six million, four hundred twenty-four thousand, six hundred forty-two".