63990801678 has 8 divisors (see below), whose sum is σ = 127981603368. Its totient is φ = 21330267224.

The previous prime is 63990801647. The next prime is 63990801691. The reversal of 63990801678 is 87610809936.

It is a sphenic number, since it is the product of 3 distinct primes.

63990801678 is an admirable number.

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, 5332566801 + ... + 5332566812.

It is an arithmetic number, because the mean of its divisors is an integer number (15997700421).

Almost surely, 2^63990801678 is an apocalyptic number.

63990801678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

63990801678 is a wasteful number, since it uses less digits than its factorization.

63990801678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10665133618.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The spelling of 63990801678 in words is "sixty-three billion, nine hundred ninety million, eight hundred one thousand, six hundred seventy-eight".