221605445541464 has 32 divisors (see below), whose sum is σ = 433579344916320. Its totient is φ = 105984364079616.

The previous prime is 221605445541449. The next prime is 221605445541481. The reversal of 221605445541464 is 464145544506122.

It is a super-2 number, since 2×221605445541464² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18514064 + ... + 28035360.

It is an arithmetic number, because the mean of its divisors is an integer number (13549354528635).

Almost surely, 2^{221605445541464} is an apocalyptic number.

It is an amenable number.

221605445541464 is a deficient number, since it is larger than the sum of its proper divisors (211973899374856).

221605445541464 is a wasteful number, since it uses less digits than its factorization.

221605445541464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9647819 (or 9647815 counting only the distinct ones).

The product of its (nonzero) digits is 18432000, while the sum is 53.

The spelling of 221605445541464 in words is "two hundred twenty-one trillion, six hundred five billion, four hundred forty-five million, five hundred forty-one thousand, four hundred sixty-four".