666330755903 has 4 divisors (see below), whose sum is σ = 687825296448. Its totient is φ = 644836215360.

The previous prime is 666330755899. The next prime is 666330755929. The reversal of 666330755903 is 309557033666.

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 666330755903 - 2² = 666330755899 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 (666330755963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10747270226 + ... + 10747270287.

It is an arithmetic number, because the mean of its divisors is an integer number (171956324112).

Almost surely, 2^666330755903 is an apocalyptic number.

666330755903 is a deficient number, since it is larger than the sum of its proper divisors (21494540545).

666330755903 is a wasteful number, since it uses less digits than its factorization.

666330755903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21494540544.

The product of its (nonzero) digits is 9185400, while the sum is 53.

The spelling of 666330755903 in words is "six hundred sixty-six billion, three hundred thirty million, seven hundred fifty-five thousand, nine hundred three".