64520064064 has 21 divisors (see below), whose sum is σ = 128036034631. Its totient is φ = 32259016000.

The previous prime is 64520064061. The next prime is 64520064083. The reversal of 64520064064 is 46046002546.

The square root of 64520064064 is 254008.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64520064061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2016189 + ... + 2047939.

Almost surely, 2^64520064064 is an apocalyptic number.

64520064064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

64520064064 is the 254008-th square number.

It is an amenable number.

64520064064 is a deficient number, since it is larger than the sum of its proper divisors (63515970567).

64520064064 is an frugal number, since it uses more digits than its factorization.

64520064064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63514 (or 31753 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 64520064064 in words is "sixty-four billion, five hundred twenty million, sixty-four thousand, sixty-four".