666606578 has 32 divisors (see below), whose sum is σ = 1156474368. Its totient is φ = 285292800.

The previous prime is 666606571. The next prime is 666606587. The reversal of 666606578 is 875606666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666606571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12026 + ... + 38442.

It is an arithmetic number, because the mean of its divisors is an integer number (36139824).

Almost surely, 2^666606578 is an apocalyptic number.

666606578 is a deficient number, since it is larger than the sum of its proper divisors (489867790).

666606578 is a wasteful number, since it uses less digits than its factorization.

666606578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26498.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The square root of 666606578 is about 25818.7253364685. The cubic root of 666606578 is about 873.5542178050.

The spelling of 666606578 in words is "six hundred sixty-six million, six hundred six thousand, five hundred seventy-eight".