55445450040221 has 4 divisors (see below), whose sum is σ = 55515017732412. Its totient is φ = 55375882348032.

The previous prime is 55445450040193. The next prime is 55445450040257. The reversal of 55445450040221 is 12204005454455.

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 46430527860025 + 9014922180196 = 6813995^2 + 3002486^2 .

It is a cyclic number.

It is not a de Polignac number, because 55445450040221 - 2¹⁴ = 55445450023837 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 (55445450040821) 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, 34783844900 + ... + 34783846493.

It is an arithmetic number, because the mean of its divisors is an integer number (13878754433103).

Almost surely, 2^{55445450040221} is an apocalyptic number.

It is an amenable number.

55445450040221 is a deficient number, since it is larger than the sum of its proper divisors (69567692191).

55445450040221 is an equidigital number, since it uses as much as digits as its factorization.

55445450040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69567692190.

The product of its (nonzero) digits is 640000, while the sum is 41.

Adding to 55445450040221 its reverse (12204005454455), we get a palindrome (67649455494676).

The spelling of 55445450040221 in words is "fifty-five trillion, four hundred forty-five billion, four hundred fifty million, forty thousand, two hundred twenty-one".