65995498781 has 2 divisors, whose sum is σ = 65995498782. Its totient is φ = 65995498780.

The previous prime is 65995498747. The next prime is 65995498787. The reversal of 65995498781 is 18789459956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35998990756 + 29996508025 = 189734^2 + 173195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65995498781 is a prime.

It is a super-2 number, since 2×65995498781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65995498787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32997749390 + 32997749391.

It is an arithmetic number, because the mean of its divisors is an integer number (32997749391).

Almost surely, 2^65995498781 is an apocalyptic number.

It is an amenable number.

65995498781 is a deficient number, since it is larger than the sum of its proper divisors (1).

65995498781 is an equidigital number, since it uses as much as digits as its factorization.

65995498781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 195955200, while the sum is 71.

The spelling of 65995498781 in words is "sixty-five billion, nine hundred ninety-five million, four hundred ninety-eight thousand, seven hundred eighty-one".