64521205513 has 8 divisors (see below), whose sum is σ = 65169104000. Its totient is φ = 63873720288.

The previous prime is 64521205457. The next prime is 64521205531. The reversal of 64521205513 is 31550212546.

64521205513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64521205513 - 2¹⁷ = 64521074441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64521208513) 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, 215413 + ... + 418861.

It is an arithmetic number, because the mean of its divisors is an integer number (8146138000).

Almost surely, 2^64521205513 is an apocalyptic number.

It is an amenable number.

64521205513 is a deficient number, since it is larger than the sum of its proper divisors (647898487).

64521205513 is a wasteful number, since it uses less digits than its factorization.

64521205513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206631.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 64521205513 in words is "sixty-four billion, five hundred twenty-one million, two hundred five thousand, five hundred thirteen".