221161555711256 has 32 divisors (see below), whose sum is σ = 418614338580480. Its totient is φ = 109531366298400.

The previous prime is 221161555711223. The next prime is 221161555711409. The reversal of 221161555711256 is 652117555161122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12919640 + ... + 24682791.

It is an arithmetic number, because the mean of its divisors is an integer number (13081698080640).

Almost surely, 2^{221161555711256} is an apocalyptic number.

It is an amenable number.

221161555711256 is a deficient number, since it is larger than the sum of its proper divisors (197452782869224).

221161555711256 is a wasteful number, since it uses less digits than its factorization.

221161555711256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37609415 (or 37609411 counting only the distinct ones).

The product of its digits is 1260000, while the sum is 50.

The spelling of 221161555711256 in words is "two hundred twenty-one trillion, one hundred sixty-one billion, five hundred fifty-five million, seven hundred eleven thousand, two hundred fifty-six".