63991777446 has 12 divisors (see below), whose sum is σ = 138648851172. Its totient is φ = 21330592476.

The previous prime is 63991777441. The next prime is 63991777459. The reversal of 63991777446 is 64477719936.

63991777446 is a `hidden beast` number, since 6 + 39 + 91 + 7 + 77 + 446 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63991777441) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1777549356 + ... + 1777549391.

It is an arithmetic number, because the mean of its divisors is an integer number (11554070931).

Almost surely, 2^63991777446 is an apocalyptic number.

63991777446 is an abundant number, since it is smaller than the sum of its proper divisors (74657073726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63991777446 is a wasteful number, since it uses less digits than its factorization.

63991777446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555098755 (or 3555098752 counting only the distinct ones).

The product of its digits is 48009024, while the sum is 63.

The spelling of 63991777446 in words is "sixty-three billion, nine hundred ninety-one million, seven hundred seventy-seven thousand, four hundred forty-six".