64363878339456 has 128 divisors (see below), whose sum is σ = 172489699441440. Its totient is φ = 21263508439040.

The previous prime is 64363878339443. The next prime is 64363878339457. The reversal of 64363878339456 is 65493387836346.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64363878339457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 998895016 + ... + 998959448.

Almost surely, 2^{64363878339456} 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 64363878339456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86244849720720).

64363878339456 is an abundant number, since it is smaller than the sum of its proper divisors (108125821101984).

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

64363878339456 is a wasteful number, since it uses less digits than its factorization.

64363878339456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87584 (or 87572 counting only the distinct ones).

The product of its digits is 5643509760, while the sum is 75.

The spelling of 64363878339456 in words is "sixty-four trillion, three hundred sixty-three billion, eight hundred seventy-eight million, three hundred thirty-nine thousand, four hundred fifty-six".