64521054557017 has 4 divisors (see below), whose sum is σ = 64634448326580. Its totient is φ = 64407660787456.

The previous prime is 64521054556997. The next prime is 64521054557101. The reversal of 64521054557017 is 71075545012546.

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 27877354569801 + 36643699987216 = 5279901^2 + 6053404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64521054557017 is a prime.

It is a super-2 number, since 2×64521054557017² (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 (64521054557417) 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, 56696883928 + ... + 56696885065.

It is an arithmetic number, because the mean of its divisors is an integer number (16158612081645).

Almost surely, 2^{64521054557017} is an apocalyptic number.

It is an amenable number.

64521054557017 is a deficient number, since it is larger than the sum of its proper divisors (113393769563).

64521054557017 is a wasteful number, since it uses less digits than its factorization.

64521054557017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113393769562.

The product of its (nonzero) digits is 5880000, while the sum is 52.

The spelling of 64521054557017 in words is "sixty-four trillion, five hundred twenty-one billion, fifty-four million, five hundred fifty-seven thousand, seventeen".