666225554 has 8 divisors (see below), whose sum is σ = 999537408. Its totient is φ = 333046420.

The previous prime is 666225509. The next prime is 666225559. The reversal of 666225554 is 455522666.

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

It is not an unprimeable number, because it can be changed into a prime (666225559) 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, 19502 + ... + 41385.

It is an arithmetic number, because the mean of its divisors is an integer number (124942176).

Almost surely, 2^666225554 is an apocalyptic number.

666225554 is a deficient number, since it is larger than the sum of its proper divisors (333311854).

666225554 is a wasteful number, since it uses less digits than its factorization.

666225554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66360.

The product of its digits is 432000, while the sum is 41.

The square root of 666225554 is about 25811.3454511771. The cubic root of 666225554 is about 873.3877485211.

The spelling of 666225554 in words is "six hundred sixty-six million, two hundred twenty-five thousand, five hundred fifty-four".