1285557880429 has 2 divisors, whose sum is σ = 1285557880430. Its totient is φ = 1285557880428.

The previous prime is 1285557880381. The next prime is 1285557880433. The reversal of 1285557880429 is 9240887555821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 715233861225 + 570324019204 = 845715^2 + 755198^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285557880429 - 2⁷ = 1285557880301 is a prime.

It is a super-2 number, since 2×1285557880429² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285557880469) 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, 642778940214 + 642778940215.

It is an arithmetic number, because the mean of its divisors is an integer number (642778940215).

Almost surely, 2^{1285557880429} is an apocalyptic number.

It is an amenable number.

1285557880429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285557880429 is an equidigital number, since it uses as much as digits as its factorization.

1285557880429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512000, while the sum is 64.

The spelling of 1285557880429 in words is "one trillion, two hundred eighty-five billion, five hundred fifty-seven million, eight hundred eighty thousand, four hundred twenty-nine".