65571051662321 has 2 divisors, whose sum is σ = 65571051662322. Its totient is φ = 65571051662320.

The previous prime is 65571051662317. The next prime is 65571051662377. The reversal of 65571051662321 is 12326615017556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42313580902321 + 23257470760000 = 6504889^2 + 4822600^2 .

It is a cyclic number.

It is not a de Polignac number, because 65571051662321 - 2² = 65571051662317 is a prime.

It is a super-2 number, since 2×65571051662321² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65571051662321.

It is not a weakly prime, because it can be changed into another prime (65571051662621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32785525831160 + 32785525831161.

It is an arithmetic number, because the mean of its divisors is an integer number (32785525831161).

Almost surely, 2^{65571051662321} is an apocalyptic number.

It is an amenable number.

65571051662321 is a deficient number, since it is larger than the sum of its proper divisors (1).

65571051662321 is an equidigital number, since it uses as much as digits as its factorization.

65571051662321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268000, while the sum is 50.

Adding to 65571051662321 its reverse (12326615017556), we get a palindrome (77897666679877).

The spelling of 65571051662321 in words is "sixty-five trillion, five hundred seventy-one billion, fifty-one million, six hundred sixty-two thousand, three hundred twenty-one".