553686232221 has 12 divisors (see below), whose sum is σ = 801724432860. Its totient is φ = 368221648320.

The previous prime is 553686232207. The next prime is 553686232247. The reversal of 553686232221 is 122232686355.

553686232221 is a `hidden beast` number, since 5 + 5 + 368 + 62 + 3 + 2 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 285765084900 + 267921147321 = 534570^2 + 517611^2 .

It is not a de Polignac number, because 553686232221 - 2⁷ = 553686232093 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553686232201) 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, 75204990 + ... + 75212351.

It is an arithmetic number, because the mean of its divisors is an integer number (66810369405).

Almost surely, 2^553686232221 is an apocalyptic number.

It is an amenable number.

553686232221 is a deficient number, since it is larger than the sum of its proper divisors (248038200639).

553686232221 is a wasteful number, since it uses less digits than its factorization.

553686232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150417756 (or 150417753 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 553686232221 in words is "five hundred fifty-three billion, six hundred eighty-six million, two hundred thirty-two thousand, two hundred twenty-one".