63994810512 has 20 divisors (see below), whose sum is σ = 165319927280. Its totient is φ = 21331603488.

The previous prime is 63994810507. The next prime is 63994810543. The reversal of 63994810512 is 21501849936.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1333225219 = 63994810512 / (6 + 3 + 9 + 9 + 4 + 8 + 1 + 0 + 5 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666612562 + ... + 666612657.

It is an arithmetic number, because the mean of its divisors is an integer number (8265996364).

Almost surely, 2^63994810512 is an apocalyptic number.

It is an amenable number.

63994810512 is an abundant number, since it is smaller than the sum of its proper divisors (101325116768).

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

63994810512 is a wasteful number, since it uses less digits than its factorization.

63994810512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333225230 (or 1333225224 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 63994810512 in words is "sixty-three billion, nine hundred ninety-four million, eight hundred ten thousand, five hundred twelve".