63321715820 has 48 divisors (see below), whose sum is σ = 146472738048. Its totient is φ = 22802516160.

The previous prime is 63321715799. The next prime is 63321715829. The reversal of 63321715820 is 2851712336.

It is not an unprimeable number, because it can be changed into a prime (63321715829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1374554 + ... + 1419873.

It is an arithmetic number, because the mean of its divisors is an integer number (3051515376).

Almost surely, 2^63321715820 is an apocalyptic number.

It is an amenable number.

63321715820 is an abundant number, since it is smaller than the sum of its proper divisors (83151022228).

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

63321715820 is a wasteful number, since it uses less digits than its factorization.

63321715820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794550 (or 2794548 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 63321715820 in words is "sixty-three billion, three hundred twenty-one million, seven hundred fifteen thousand, eight hundred twenty".