551161642221 has 12 divisors (see below), whose sum is σ = 796338112960. Its totient is φ = 367341522120.

The previous prime is 551161642211. The next prime is 551161642267. The reversal of 551161642221 is 122246161155.

551161642221 is a `hidden beast` number, since 5 + 5 + 1 + 1 + 6 + 1 + 642 + 2 + 2 + 1 = 666.

551161642221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 551161642221 - 2¹¹ = 551161640173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551161642211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8262661 + ... + 8329098.

Almost surely, 2^551161642221 is an apocalyptic number.

It is an amenable number.

551161642221 is a deficient number, since it is larger than the sum of its proper divisors (245176470739).

551161642221 is a wasteful number, since it uses less digits than its factorization.

551161642221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16595456 (or 16595453 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The spelling of 551161642221 in words is "five hundred fifty-one billion, one hundred sixty-one million, six hundred forty-two thousand, two hundred twenty-one".