65265742781 has 2 divisors, whose sum is σ = 65265742782. Its totient is φ = 65265742780.

The previous prime is 65265742699. The next prime is 65265742799. The reversal of 65265742781 is 18724756256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38451680281 + 26814062500 = 196091^2 + 163750^2 .

It is a cyclic number.

It is not a de Polignac number, because 65265742781 - 2³⁴ = 48085873597 is a prime.

It is a super-2 number, since 2×65265742781² (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 (65265742081) 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, 32632871390 + 32632871391.

It is an arithmetic number, because the mean of its divisors is an integer number (32632871391).

Almost surely, 2^65265742781 is an apocalyptic number.

It is an amenable number.

65265742781 is a deficient number, since it is larger than the sum of its proper divisors (1).

65265742781 is an equidigital number, since it uses as much as digits as its factorization.

65265742781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5644800, while the sum is 53.

The spelling of 65265742781 in words is "sixty-five billion, two hundred sixty-five million, seven hundred forty-two thousand, seven hundred eighty-one".