666553303 has 8 divisors (see below), whose sum is σ = 719370288. Its totient is φ = 613956864.

The previous prime is 666553259. The next prime is 666553331. The reversal of 666553303 is 303355666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666553303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666553403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48826 + ... + 60967.

It is an arithmetic number, because the mean of its divisors is an integer number (89921286).

Almost surely, 2^666553303 is an apocalyptic number.

666553303 is a deficient number, since it is larger than the sum of its proper divisors (52816985).

666553303 is a wasteful number, since it uses less digits than its factorization.

666553303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110273.

The product of its (nonzero) digits is 145800, while the sum is 37.

The square root of 666553303 is about 25817.6936034186. The cubic root of 666553303 is about 873.5309457871.

The spelling of 666553303 in words is "six hundred sixty-six million, five hundred fifty-three thousand, three hundred three".