666455542 has 4 divisors (see below), whose sum is σ = 999683316. Its totient is φ = 333227770.

The previous prime is 666455519. The next prime is 666455593. The reversal of 666455542 is 245554666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166613884 + ... + 166613887.

It is an arithmetic number, because the mean of its divisors is an integer number (249920829).

Almost surely, 2^666455542 is an apocalyptic number.

666455542 is a deficient number, since it is larger than the sum of its proper divisors (333227774).

666455542 is a wasteful number, since it uses less digits than its factorization.

666455542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333227773.

The product of its digits is 864000, while the sum is 43.

The square root of 666455542 is about 25815.8002393883. The cubic root of 666455542 is about 873.4882378077.

The spelling of 666455542 in words is "six hundred sixty-six million, four hundred fifty-five thousand, five hundred forty-two".