2221644551156 has 6 divisors (see below), whose sum is σ = 3887877964530. Its totient is φ = 1110822275576.

The previous prime is 2221644551117. The next prime is 2221644551177. The reversal of 2221644551156 is 6511554461222.

It can be written as a sum of positive squares in only one way, i.e., 2221637946256 + 6604900 = 1490516^2 + 2570^2 .

It is a super-2 number, since 2×2221644551156² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277705568891 + ... + 277705568898.

It is an arithmetic number, because the mean of its divisors is an integer number (647979660755).

Almost surely, 2^{2221644551156} is an apocalyptic number.

It is an amenable number.

2221644551156 is a deficient number, since it is larger than the sum of its proper divisors (1666233413374).

2221644551156 is a wasteful number, since it uses less digits than its factorization.

2221644551156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555411137793 (or 555411137791 counting only the distinct ones).

The product of its digits is 576000, while the sum is 44.

The spelling of 2221644551156 in words is "two trillion, two hundred twenty-one billion, six hundred forty-four million, five hundred fifty-one thousand, one hundred fifty-six".