666650635 has 12 divisors (see below), whose sum is σ = 930590208. Its totient is φ = 457131696.

The previous prime is 666650627. The next prime is 666650641. The reversal of 666650635 is 536056666.

It is a happy number.

It is not a de Polignac number, because 666650635 - 2³ = 666650627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666650591 and 666650600.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1360267 + ... + 1360756.

It is an arithmetic number, because the mean of its divisors is an integer number (77549184).

Almost surely, 2^666650635 is an apocalyptic number.

666650635 is a deficient number, since it is larger than the sum of its proper divisors (263939573).

666650635 is a wasteful number, since it uses less digits than its factorization.

666650635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721042 (or 2721035 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 43.

The square root of 666650635 is about 25819.5785209596. The cubic root of 666650635 is about 873.5734622048.

The spelling of 666650635 in words is "six hundred sixty-six million, six hundred fifty thousand, six hundred thirty-five".