666662042 has 8 divisors (see below), whose sum is σ = 1000898100. Its totient is φ = 333029344.

The previous prime is 666662039. The next prime is 666662047. The reversal of 666662042 is 240266666.

It can be written as a sum of positive squares in 2 ways, for example, as 613503361 + 53158681 = 24769^2 + 7291^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 666661987 and 666662005.

It is not an unprimeable number, because it can be changed into a prime (666662047) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 148067 + ... + 152502.

Almost surely, 2^666662042 is an apocalyptic number.

666662042 is a deficient number, since it is larger than the sum of its proper divisors (334236058).

666662042 is a wasteful number, since it uses less digits than its factorization.

666662042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301680.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 666662042 is about 25819.7994182759. The cubic root of 666662042 is about 873.5784447224.

The spelling of 666662042 in words is "six hundred sixty-six million, six hundred sixty-two thousand, forty-two".