666442080442 has 4 divisors (see below), whose sum is σ = 999663120666. Its totient is φ = 333221040220.

The previous prime is 666442080413. The next prime is 666442080517. The reversal of 666442080442 is 244080244666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244080244666 = 2 ⋅122040122333.

It can be written as a sum of positive squares in only one way, i.e., 432583759521 + 233858320921 = 657711^2 + 483589^2 .

It is a super-2 number, since 2×666442080442² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666442080392 and 666442080401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166610520109 + ... + 166610520112.

Almost surely, 2^666442080442 is an apocalyptic number.

666442080442 is a deficient number, since it is larger than the sum of its proper divisors (333221040224).

666442080442 is a wasteful number, since it uses less digits than its factorization.

666442080442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333221040223.

The product of its (nonzero) digits is 1769472, while the sum is 46.

The spelling of 666442080442 in words is "six hundred sixty-six billion, four hundred forty-two million, eighty thousand, four hundred forty-two".