666387606 has 8 divisors (see below), whose sum is σ = 1332775224. Its totient is φ = 222129200.

The previous prime is 666387593. The next prime is 666387643. The reversal of 666387606 is 606783666.

It is a happy number.

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

666387606 is an admirable number.

It is a super-2 number, since 2×666387606² = 888144882860822472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55532295 + ... + 55532306.

It is an arithmetic number, because the mean of its divisors is an integer number (166596903).

Almost surely, 2^666387606 is an apocalyptic number.

666387606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666387606 is a wasteful number, since it uses less digits than its factorization.

666387606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111064606.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The square root of 666387606 is about 25814.4844225098. The cubic root of 666387606 is about 873.4585567514.

The spelling of 666387606 in words is "six hundred sixty-six million, three hundred eighty-seven thousand, six hundred six".