63661576445 has 4 divisors (see below), whose sum is σ = 76393891740. Its totient is φ = 50929261152.

The previous prime is 63661576441. The next prime is 63661576463. The reversal of 63661576445 is 54467516636.

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 38175688996 + 25485887449 = 195386^2 + 159643^2 .

It is a cyclic number.

It is not a de Polignac number, because 63661576445 - 2² = 63661576441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63661576441) 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, 6366157640 + ... + 6366157649.

It is an arithmetic number, because the mean of its divisors is an integer number (19098472935).

Almost surely, 2^63661576445 is an apocalyptic number.

It is an amenable number.

63661576445 is a deficient number, since it is larger than the sum of its proper divisors (12732315295).

63661576445 is a wasteful number, since it uses less digits than its factorization.

63661576445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12732315294.

The product of its digits is 10886400, while the sum is 53.

The spelling of 63661576445 in words is "sixty-three billion, six hundred sixty-one million, five hundred seventy-six thousand, four hundred forty-five".