65754411721 has 2 divisors, whose sum is σ = 65754411722. Its totient is φ = 65754411720.

The previous prime is 65754411521. The next prime is 65754411727. The reversal of 65754411721 is 12711445756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65504771721 + 249640000 = 255939^2 + 15800^2 .

It is a cyclic number.

It is not a de Polignac number, because 65754411721 - 2¹³ = 65754403529 is a prime.

It is not a weakly prime, because it can be changed into another prime (65754411727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32877205860 + 32877205861.

It is an arithmetic number, because the mean of its divisors is an integer number (32877205861).

Almost surely, 2^65754411721 is an apocalyptic number.

It is an amenable number.

65754411721 is a deficient number, since it is larger than the sum of its proper divisors (1).

65754411721 is an equidigital number, since it uses as much as digits as its factorization.

65754411721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 43.

The spelling of 65754411721 in words is "sixty-five billion, seven hundred fifty-four million, four hundred eleven thousand, seven hundred twenty-one".