63691017408 has 84 divisors (see below), whose sum is σ = 182675753520. Its totient is φ = 21216738816.

The previous prime is 63691017359. The next prime is 63691017461. The reversal of 63691017408 is 80471019636.

It is a happy number.

63691017408 is a `hidden beast` number, since 636 + 9 + 1 + 0 + 1 + 7 + 4 + 0 + 8 = 666.

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 11 ways as a sum of consecutive naturals, for example, 885253 + ... + 954491.

Almost surely, 2^63691017408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63691017408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91337876760).

63691017408 is an abundant number, since it is smaller than the sum of its proper divisors (118984736112).

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

63691017408 is a wasteful number, since it uses less digits than its factorization.

63691017408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70854 (or 70841 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 63691017408 in words is "sixty-three billion, six hundred ninety-one million, seventeen thousand, four hundred eight".