64568842816 has 63 divisors (see below), whose sum is σ = 134038883433. Its totient is φ = 30858389760.

The previous prime is 64568842813. The next prime is 64568842829. The reversal of 64568842816 is 61824886546.

It is a happy number.

The square root of 64568842816 is 254104.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 29345060416 + 35223782400 = 171304^2 + 187680^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64568842813) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 46754446 + ... + 46755826.

Almost surely, 2^64568842816 is an apocalyptic number.

64568842816 is the 254104-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64568842816

64568842816 is an abundant number, since it is smaller than the sum of its proper divisors (69470040617).

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

64568842816 is an frugal number, since it uses more digits than its factorization.

64568842816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820 (or 1406 counting only the distinct ones).

The product of its digits is 17694720, while the sum is 58.

The spelling of 64568842816 in words is "sixty-four billion, five hundred sixty-eight million, eight hundred forty-two thousand, eight hundred sixteen".