64544205313 has 4 divisors (see below), whose sum is σ = 73764806080. Its totient is φ = 55323604548.

The previous prime is 64544205287. The next prime is 64544205317. The reversal of 64544205313 is 31350244546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64544205313 - 2¹³ = 64544197121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64544205317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4610300373 + ... + 4610300386.

It is an arithmetic number, because the mean of its divisors is an integer number (18441201520).

Almost surely, 2^64544205313 is an apocalyptic number.

It is an amenable number.

64544205313 is a deficient number, since it is larger than the sum of its proper divisors (9220600767).

64544205313 is an equidigital number, since it uses as much as digits as its factorization.

64544205313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220600766.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 64544205313 its reverse (31350244546), we get a palindrome (95894449859).

The spelling of 64544205313 in words is "sixty-four billion, five hundred forty-four million, two hundred five thousand, three hundred thirteen".