221655635664423 has 8 divisors (see below), whose sum is σ = 295540916727408. Its totient is φ = 147770389188864.

The previous prime is 221655635664409. The next prime is 221655635664431. The reversal of 221655635664423 is 324466536556122.

221655635664423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221655635664423 - 2²⁹ = 221655098793511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221655635664493) 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, 18328461 + ... + 27914937.

It is an arithmetic number, because the mean of its divisors is an integer number (36942614590926).

Almost surely, 2^{221655635664423} is an apocalyptic number.

221655635664423 is a deficient number, since it is larger than the sum of its proper divisors (73885281062985).

221655635664423 is an equidigital number, since it uses as much as digits as its factorization.

221655635664423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17293713.

The product of its digits is 186624000, while the sum is 60.

The spelling of 221655635664423 in words is "two hundred twenty-one trillion, six hundred fifty-five billion, six hundred thirty-five million, six hundred sixty-four thousand, four hundred twenty-three".