64536517 has 4 divisors (see below), whose sum is σ = 64626016. Its totient is φ = 64447020.

The previous prime is 64536509. The next prime is 64536523. The reversal of 64536517 is 71563546.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71563546 = 2 ⋅35781773.

It is a cyclic number.

It is not a de Polignac number, because 64536517 - 2³ = 64536509 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 (64536557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43659 + ... + 45112.

It is an arithmetic number, because the mean of its divisors is an integer number (16156504).

Almost surely, 2^64536517 is an apocalyptic number.

It is an amenable number.

64536517 is a deficient number, since it is larger than the sum of its proper divisors (89499).

64536517 is an equidigital number, since it uses as much as digits as its factorization.

64536517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89498.

The product of its digits is 75600, while the sum is 37.

The square root of 64536517 is about 8033.4623295314. The cubic root of 64536517 is about 401.1146348379.

The spelling of 64536517 in words is "sixty-four million, five hundred thirty-six thousand, five hundred seventeen".