64663639548 has 24 divisors (see below), whose sum is σ = 151184208000. Its totient is φ = 21511349040.

The previous prime is 64663639543. The next prime is 64663639549. The reversal of 64663639548 is 84593636646.

It is a junction number, because it is equal to n+sod(n) for n = 64663639491 and 64663639500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64663639541) 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 7 ways as a sum of consecutive naturals, for example, 5393448 + ... + 5405423.

It is an arithmetic number, because the mean of its divisors is an integer number (6299342000).

Almost surely, 2^64663639548 is an apocalyptic number.

It is an amenable number.

64663639548 is an abundant number, since it is smaller than the sum of its proper divisors (86520568452).

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

64663639548 is a wasteful number, since it uses less digits than its factorization.

64663639548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10799377 (or 10799375 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 60.

The spelling of 64663639548 in words is "sixty-four billion, six hundred sixty-three million, six hundred thirty-nine thousand, five hundred forty-eight".