65720533979567 has 2 divisors, whose sum is σ = 65720533979568. Its totient is φ = 65720533979566.

The previous prime is 65720533979491. The next prime is 65720533979603. The reversal of 65720533979567 is 76597933502756.

It is a happy number.

65720533979567 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65720533979567 - 2¹⁰ = 65720533978543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65720533979494 and 65720533979503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65720533975567) 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 as a sum of consecutive naturals, namely, 32860266989783 + 32860266989784.

It is an arithmetic number, because the mean of its divisors is an integer number (32860266989784).

Almost surely, 2^{65720533979567} is an apocalyptic number.

65720533979567 is a deficient number, since it is larger than the sum of its proper divisors (1).

65720533979567 is an equidigital number, since it uses as much as digits as its factorization.

65720533979567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250423000, while the sum is 74.

The spelling of 65720533979567 in words is "sixty-five trillion, seven hundred twenty billion, five hundred thirty-three million, nine hundred seventy-nine thousand, five hundred sixty-seven".