1285799516761 has 2 divisors, whose sum is σ = 1285799516762. Its totient is φ = 1285799516760.

The previous prime is 1285799516753. The next prime is 1285799516819. The reversal of 1285799516761 is 1676159975821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144859340361 + 140940176400 = 1069981^2 + 375420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285799516761 - 2³ = 1285799516753 is a prime.

It is a super-2 number, since 2×1285799516761² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1285799516731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642899758380 + 642899758381.

It is an arithmetic number, because the mean of its divisors is an integer number (642899758381).

Almost surely, 2^{1285799516761} is an apocalyptic number.

It is an amenable number.

1285799516761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285799516761 is an equidigital number, since it uses as much as digits as its factorization.

1285799516761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57153600, while the sum is 67.

The spelling of 1285799516761 in words is "one trillion, two hundred eighty-five billion, seven hundred ninety-nine million, five hundred sixteen thousand, seven hundred sixty-one".