1291766816953 has 2 divisors, whose sum is σ = 1291766816954. Its totient is φ = 1291766816952.

The previous prime is 1291766816839. The next prime is 1291766816987. The reversal of 1291766816953 is 3596186671921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 913951296064 + 377815520889 = 956008^2 + 614667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291766816953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291766816993) 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, 645883408476 + 645883408477.

It is an arithmetic number, because the mean of its divisors is an integer number (645883408477).

Almost surely, 2^{1291766816953} is an apocalyptic number.

It is an amenable number.

1291766816953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291766816953 is an equidigital number, since it uses as much as digits as its factorization.

1291766816953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29393280, while the sum is 64.

The spelling of 1291766816953 in words is "one trillion, two hundred ninety-one billion, seven hundred sixty-six million, eight hundred sixteen thousand, nine hundred fifty-three".