666630505 has 32 divisors (see below), whose sum is σ = 862430976. Its totient is φ = 493430784.

The previous prime is 666630491. The next prime is 666630533. The reversal of 666630505 is 505036666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 666630505 - 2⁵ = 666630473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 558189 + ... + 559381.

It is an arithmetic number, because the mean of its divisors is an integer number (26950968).

Almost surely, 2^666630505 is an apocalyptic number.

It is an amenable number.

666630505 is a deficient number, since it is larger than the sum of its proper divisors (195800471).

666630505 is a wasteful number, since it uses less digits than its factorization.

666630505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 666630505 is about 25819.1886975559. The cubic root of 666630505 is about 873.5646693879.

The spelling of 666630505 in words is "six hundred sixty-six million, six hundred thirty thousand, five hundred five".