65102791681 has 2 divisors, whose sum is σ = 65102791682. Its totient is φ = 65102791680.

The previous prime is 65102791669. The next prime is 65102791723. The reversal of 65102791681 is 18619720156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64117836225 + 984955456 = 253215^2 + 31384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65102791681 is a prime.

It is a super-2 number, since 2×65102791681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65102791631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32551395840 + 32551395841.

It is an arithmetic number, because the mean of its divisors is an integer number (32551395841).

Almost surely, 2^65102791681 is an apocalyptic number.

It is an amenable number.

65102791681 is a deficient number, since it is larger than the sum of its proper divisors (1).

65102791681 is an equidigital number, since it uses as much as digits as its factorization.

65102791681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 65102791681 in words is "sixty-five billion, one hundred two million, seven hundred ninety-one thousand, six hundred eighty-one".