245553542544221 has 8 divisors (see below), whose sum is σ = 264260128717944. Its totient is φ = 227320540830720.

The previous prime is 245553542544173. The next prime is 245553542544239. The reversal of 245553542544221 is 122445245355542.

It can be written as a sum of positive squares in 4 ways, for example, as 27225582938596 + 218327959605625 = 5217814^2 + 14775925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245553542544221 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 (245553542544241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118396113980 + ... + 118396116053.

It is an arithmetic number, because the mean of its divisors is an integer number (33032516089743).

Almost surely, 2^{245553542544221} is an apocalyptic number.

It is an amenable number.

245553542544221 is a deficient number, since it is larger than the sum of its proper divisors (18706586173723).

245553542544221 is a wasteful number, since it uses less digits than its factorization.

245553542544221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236792230111.

The product of its digits is 38400000, while the sum is 53.

Adding to 245553542544221 its reverse (122445245355542), we get a palindrome (367998787899763).

The spelling of 245553542544221 in words is "two hundred forty-five trillion, five hundred fifty-three billion, five hundred forty-two million, five hundred forty-four thousand, two hundred twenty-one".