55563566026221 has 40 divisors (see below), whose sum is σ = 91103543170464. Its totient is φ = 33468294005280.

The previous prime is 55563566026193. The next prime is 55563566026237. The reversal of 55563566026221 is 12262066536555.

55563566026221 is a `hidden beast` number, since 5 + 5 + 5 + 6 + 3 + 5 + 6 + 6 + 0 + 2 + 622 + 1 = 666.

It is not a de Polignac number, because 55563566026221 - 2⁷ = 55563566026093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55563566026261) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 191145886 + ... + 191436351.

Almost surely, 2^{55563566026221} is an apocalyptic number.

It is an amenable number.

55563566026221 is a deficient number, since it is larger than the sum of its proper divisors (35539977144243).

55563566026221 is a wasteful number, since it uses less digits than its factorization.

55563566026221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382582423 (or 382582414 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 54.

The spelling of 55563566026221 in words is "fifty-five trillion, five hundred sixty-three billion, five hundred sixty-six million, twenty-six thousand, two hundred twenty-one".