245553255221 has 4 divisors (see below), whose sum is σ = 245642843244. Its totient is φ = 245463667200.

The previous prime is 245553255179. The next prime is 245553255287. The reversal of 245553255221 is 122552355542.

It is a happy number.

245553255221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122552355542 = 2 ⋅61276177771.

It can be written as a sum of positive squares in 2 ways, for example, as 142117690225 + 103435564996 = 376985^2 + 321614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245553255221 is a prime.

It is a super-2 number, since 2×245553255221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245553255721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44789900 + ... + 44795381.

It is an arithmetic number, because the mean of its divisors is an integer number (61410710811).

Almost surely, 2^245553255221 is an apocalyptic number.

It is an amenable number.

245553255221 is a deficient number, since it is larger than the sum of its proper divisors (89588023).

245553255221 is an equidigital number, since it uses as much as digits as its factorization.

245553255221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89588022.

The product of its digits is 600000, while the sum is 41.

The spelling of 245553255221 in words is "two hundred forty-five billion, five hundred fifty-three million, two hundred fifty-five thousand, two hundred twenty-one".