63531606521 has 8 divisors (see below), whose sum is σ = 64771709184. Its totient is φ = 62293037040.

The previous prime is 63531606473. The next prime is 63531606527. The reversal of 63531606521 is 12560613536.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63531606521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63531606527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299435 + ... + 465536.

It is an arithmetic number, because the mean of its divisors is an integer number (8096463648).

Almost surely, 2^63531606521 is an apocalyptic number.

It is an amenable number.

63531606521 is a deficient number, since it is larger than the sum of its proper divisors (1240102663).

63531606521 is a wasteful number, since it uses less digits than its factorization.

63531606521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766591.

The product of its (nonzero) digits is 97200, while the sum is 38.

The spelling of 63531606521 in words is "sixty-three billion, five hundred thirty-one million, six hundred six thousand, five hundred twenty-one".