21666230566003 has 4 divisors (see below), whose sum is σ = 21666252527968. Its totient is φ = 21666208604040.

The previous prime is 21666230565919. The next prime is 21666230566033. The reversal of 21666230566003 is 30066503266612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21666230566003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21666230566033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9427968 + ... + 11498653.

It is an arithmetic number, because the mean of its divisors is an integer number (5416563131992).

Almost surely, 2^{21666230566003} is an apocalyptic number.

21666230566003 is a deficient number, since it is larger than the sum of its proper divisors (21961965).

21666230566003 is a wasteful number, since it uses less digits than its factorization.

21666230566003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21961964.

The product of its (nonzero) digits is 1399680, while the sum is 46.

The spelling of 21666230566003 in words is "twenty-one trillion, six hundred sixty-six billion, two hundred thirty million, five hundred sixty-six thousand, three".