55415325300221 has 4 divisors (see below), whose sum is σ = 55630949134332. Its totient is φ = 55199701466112.

The previous prime is 55415325300217. The next prime is 55415325300229. The reversal of 55415325300221 is 12200352351455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33268785768100 + 22146539532121 = 5767910^2 + 4706011^2 .

It is a cyclic number.

It is not a de Polignac number, because 55415325300221 - 2² = 55415325300217 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 (55415325300229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107811916670 + ... + 107811917183.

It is an arithmetic number, because the mean of its divisors is an integer number (13907737283583).

Almost surely, 2^{55415325300221} is an apocalyptic number.

It is an amenable number.

55415325300221 is a deficient number, since it is larger than the sum of its proper divisors (215623834111).

55415325300221 is a wasteful number, since it uses less digits than its factorization.

55415325300221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215623834110.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 55415325300221 its reverse (12200352351455), we get a palindrome (67615677651676).

The spelling of 55415325300221 in words is "fifty-five trillion, four hundred fifteen billion, three hundred twenty-five million, three hundred thousand, two hundred twenty-one".