551305543221 has 64 divisors (see below), whose sum is σ = 860602890240. Its totient is φ = 348121509120.

The previous prime is 551305543157. The next prime is 551305543249. The reversal of 551305543221 is 122345503155.

551305543221 is a `hidden beast` number, since 5 + 51 + 3 + 0 + 554 + 32 + 21 = 666.

It is not a de Polignac number, because 551305543221 - 2⁶ = 551305543157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551305543121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 91713106 + ... + 91719116.

It is an arithmetic number, because the mean of its divisors is an integer number (13446920160).

Almost surely, 2^551305543221 is an apocalyptic number.

It is an amenable number.

551305543221 is a deficient number, since it is larger than the sum of its proper divisors (309297347019).

551305543221 is a wasteful number, since it uses less digits than its factorization.

551305543221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7463 (or 7457 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The spelling of 551305543221 in words is "five hundred fifty-one billion, three hundred five million, five hundred forty-three thousand, two hundred twenty-one".