64520768325563 has 16 divisors (see below), whose sum is σ = 71380376174592. Its totient is φ = 57826904184000.

The previous prime is 64520768325527. The next prime is 64520768325569. The reversal of 64520768325563 is 36552386702546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64520768325563 - 2⁶ = 64520768325499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64520768325496 and 64520768325505.

It is not an unprimeable number, because it can be changed into a prime (64520768325569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19047878 + ... + 22177988.

It is an arithmetic number, because the mean of its divisors is an integer number (4461273510912).

Almost surely, 2^{64520768325563} is an apocalyptic number.

64520768325563 is a deficient number, since it is larger than the sum of its proper divisors (6859607849029).

64520768325563 is a wasteful number, since it uses less digits than its factorization.

64520768325563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156586.

The product of its (nonzero) digits is 217728000, while the sum is 62.

The spelling of 64520768325563 in words is "sixty-four trillion, five hundred twenty billion, seven hundred sixty-eight million, three hundred twenty-five thousand, five hundred sixty-three".