21655166632003 has 2 divisors, whose sum is σ = 21655166632004. Its totient is φ = 21655166632002.

The previous prime is 21655166631949. The next prime is 21655166632067. The reversal of 21655166632003 is 30023666155612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21655166632003 - 2¹⁷ = 21655166500931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21655166632093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10827583316001 + 10827583316002.

It is an arithmetic number, because the mean of its divisors is an integer number (10827583316002).

Almost surely, 2^{21655166632003} is an apocalyptic number.

21655166632003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21655166632003 is an equidigital number, since it uses as much as digits as its factorization.

21655166632003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 21655166632003 in words is "twenty-one trillion, six hundred fifty-five billion, one hundred sixty-six million, six hundred thirty-two thousand, three".