65788756321 has 2 divisors, whose sum is σ = 65788756322. Its totient is φ = 65788756320.

The previous prime is 65788756309. The next prime is 65788756351. The reversal of 65788756321 is 12365788756.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57197505600 + 8591250721 = 239160^2 + 92689^2 .

It is a cyclic number.

It is not a de Polignac number, because 65788756321 - 2⁷ = 65788756193 is a prime.

It is not a weakly prime, because it can be changed into another prime (65788756351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32894378160 + 32894378161.

It is an arithmetic number, because the mean of its divisors is an integer number (32894378161).

Almost surely, 2^65788756321 is an apocalyptic number.

It is an amenable number.

65788756321 is a deficient number, since it is larger than the sum of its proper divisors (1).

65788756321 is an equidigital number, since it uses as much as digits as its factorization.

65788756321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16934400, while the sum is 58.

The spelling of 65788756321 in words is "sixty-five billion, seven hundred eighty-eight million, seven hundred fifty-six thousand, three hundred twenty-one".