666542042 has 16 divisors (see below), whose sum is σ = 1005264000. Its totient is φ = 331459440.

The previous prime is 666542033. The next prime is 666542077. The reversal of 666542042 is 240245666.

It is a junction number, because it is equal to n+sod(n) for n = 666541993 and 666542011.

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, 371684 + ... + 373472.

It is an arithmetic number, because the mean of its divisors is an integer number (62829000).

Almost surely, 2^666542042 is an apocalyptic number.

666542042 is a deficient number, since it is larger than the sum of its proper divisors (338721958).

666542042 is a wasteful number, since it uses less digits than its factorization.

666542042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 666542042 is about 25817.4755156270. The cubic root of 666542042 is about 873.5260265069.

The spelling of 666542042 in words is "six hundred sixty-six million, five hundred forty-two thousand, forty-two".