221655449635 has 16 divisors (see below), whose sum is σ = 272799938880. Its totient is φ = 172826409600.

The previous prime is 221655449591. The next prime is 221655449641. The reversal of 221655449635 is 536944556122.

It is a de Polignac number, because none of the positive numbers 2^k-221655449635 is a prime.

It is a super-2 number, since 2×221655449635² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2729640 + ... + 2809669.

It is an arithmetic number, because the mean of its divisors is an integer number (17049996180).

Almost surely, 2^221655449635 is an apocalyptic number.

221655449635 is a deficient number, since it is larger than the sum of its proper divisors (51144489245).

221655449635 is a wasteful number, since it uses less digits than its factorization.

221655449635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5539518.

The product of its digits is 7776000, while the sum is 52.

The spelling of 221655449635 in words is "two hundred twenty-one billion, six hundred fifty-five million, four hundred forty-nine thousand, six hundred thirty-five".