64706570723513 has 4 divisors (see below), whose sum is σ = 68512839589620. Its totient is φ = 60900301857408.

The previous prime is 64706570723381. The next prime is 64706570723537. The reversal of 64706570723513 is 31532707560746.

64706570723513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52974116702224 + 11732454021289 = 7278332^2 + 3425267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64706570723513 is a prime.

It is a super-2 number, since 2×64706570723513² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64706570723563) 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 3 ways as a sum of consecutive naturals, for example, 1903134433028 + ... + 1903134433061.

It is an arithmetic number, because the mean of its divisors is an integer number (17128209897405).

Almost surely, 2^{64706570723513} is an apocalyptic number.

It is an amenable number.

64706570723513 is a deficient number, since it is larger than the sum of its proper divisors (3806268866107).

64706570723513 is a wasteful number, since it uses less digits than its factorization.

64706570723513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806268866106.

The product of its (nonzero) digits is 22226400, while the sum is 56.

The spelling of 64706570723513 in words is "sixty-four trillion, seven hundred six billion, five hundred seventy million, seven hundred twenty-three thousand, five hundred thirteen".