666553703 has 4 divisors (see below), whose sum is σ = 669319728. Its totient is φ = 663787680.

The previous prime is 666553651. The next prime is 666553711. The reversal of 666553703 is 307355666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666553703 - 2¹² = 666549607 is a prime.

It is a Duffinian number.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1382651 + ... + 1383132.

It is an arithmetic number, because the mean of its divisors is an integer number (167329932).

Almost surely, 2^666553703 is an apocalyptic number.

666553703 is a deficient number, since it is larger than the sum of its proper divisors (2766025).

666553703 is a wasteful number, since it uses less digits than its factorization.

666553703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2766024.

The product of its (nonzero) digits is 340200, while the sum is 41.

The square root of 666553703 is about 25817.7013500428. The cubic root of 666553703 is about 873.5311205229.

The spelling of 666553703 in words is "six hundred sixty-six million, five hundred fifty-three thousand, seven hundred three".