64405513013 has 8 divisors (see below), whose sum is σ = 68459423832. Its totient is φ = 60381085696.

The previous prime is 64405513009. The next prime is 64405513033. The reversal of 64405513013 is 31031550446.

It can be written as a sum of positive squares in 4 ways, for example, as 15361867249 + 49043645764 = 123943^2 + 221458^2 .

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 64405513013 - 2² = 64405513009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64405513033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7366370 + ... + 7375107.

It is an arithmetic number, because the mean of its divisors is an integer number (8557427979).

Almost surely, 2^64405513013 is an apocalyptic number.

It is an amenable number.

64405513013 is a deficient number, since it is larger than the sum of its proper divisors (4053910819).

64405513013 is a wasteful number, since it uses less digits than its factorization.

64405513013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14741751.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 64405513013 in words is "sixty-four billion, four hundred five million, five hundred thirteen thousand, thirteen".