63444227557 has 4 divisors (see below), whose sum is σ = 63465715180. Its totient is φ = 63422739936.

The previous prime is 63444227513. The next prime is 63444227593. The reversal of 63444227557 is 75572244436.

63444227557 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.

It can be written as a sum of positive squares in 2 ways, for example, as 60122549601 + 3321677956 = 245199^2 + 57634^2 .

It is a cyclic number.

It is not a de Polignac number, because 63444227557 - 2¹⁵ = 63444194789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63444227557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63444221557) 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, 10739382 + ... + 10745287.

It is an arithmetic number, because the mean of its divisors is an integer number (15866428795).

Almost surely, 2^63444227557 is an apocalyptic number.

It is an amenable number.

63444227557 is a deficient number, since it is larger than the sum of its proper divisors (21487623).

63444227557 is a wasteful number, since it uses less digits than its factorization.

63444227557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21487622.

The product of its digits is 5644800, while the sum is 49.

The spelling of 63444227557 in words is "sixty-three billion, four hundred forty-four million, two hundred twenty-seven thousand, five hundred fifty-seven".