63776561872 has 20 divisors (see below), whose sum is σ = 123835144356. Its totient is φ = 31819105280.

The previous prime is 63776561843. The next prime is 63776561911. The reversal of 63776561872 is 27816567736.

It can be written as a sum of positive squares in 2 ways, for example, as 44009326656 + 19767235216 = 209784^2 + 140596^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4315873 + ... + 4330624.

Almost surely, 2^63776561872 is an apocalyptic number.

It is an amenable number.

63776561872 is a deficient number, since it is larger than the sum of its proper divisors (60058582484).

63776561872 is a wasteful number, since it uses less digits than its factorization.

63776561872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8646966 (or 8646960 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 58.

The spelling of 63776561872 in words is "sixty-three billion, seven hundred seventy-six million, five hundred sixty-one thousand, eight hundred seventy-two".