63537394816 has 64 divisors (see below), whose sum is σ = 144697020480. Its totient is φ = 27223538688.

The previous prime is 63537394813. The next prime is 63537394829. The reversal of 63537394816 is 61849373536.

63537394816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (63537394813) 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, 5546791 + ... + 5558233.

It is an arithmetic number, because the mean of its divisors is an integer number (2260890945).

Almost surely, 2^63537394816 is an apocalyptic number.

It is an amenable number.

63537394816 is an abundant number, since it is smaller than the sum of its proper divisors (81159625664).

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

63537394816 is a wasteful number, since it uses less digits than its factorization.

63537394816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17661 (or 17649 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 55.

The spelling of 63537394816 in words is "sixty-three billion, five hundred thirty-seven million, three hundred ninety-four thousand, eight hundred sixteen".