65820456397 has 2 divisors, whose sum is σ = 65820456398. Its totient is φ = 65820456396.

The previous prime is 65820456391. The next prime is 65820456437. The reversal of 65820456397 is 79365402856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62645584681 + 3174871716 = 250291^2 + 56346^2 .

It is a cyclic number.

It is not a de Polignac number, because 65820456397 - 2⁷ = 65820456269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65820456391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32910228198 + 32910228199.

It is an arithmetic number, because the mean of its divisors is an integer number (32910228199).

Almost surely, 2^65820456397 is an apocalyptic number.

It is an amenable number.

65820456397 is a deficient number, since it is larger than the sum of its proper divisors (1).

65820456397 is an equidigital number, since it uses as much as digits as its factorization.

65820456397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 65820456397 in words is "sixty-five billion, eight hundred twenty million, four hundred fifty-six thousand, three hundred ninety-seven".