1268202700781 has 2 divisors, whose sum is σ = 1268202700782. Its totient is φ = 1268202700780.

The previous prime is 1268202700663. The next prime is 1268202700837. The reversal of 1268202700781 is 1870072028621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 964225802500 + 303976898281 = 981950^2 + 551341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268202700781 is a prime.

It is a super-2 number, since 2×1268202700781² (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 (1268202700181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634101350390 + 634101350391.

It is an arithmetic number, because the mean of its divisors is an integer number (634101350391).

Almost surely, 2^{1268202700781} is an apocalyptic number.

It is an amenable number.

1268202700781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268202700781 is an equidigital number, since it uses as much as digits as its factorization.

1268202700781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 44.

The spelling of 1268202700781 in words is "one trillion, two hundred sixty-eight billion, two hundred two million, seven hundred thousand, seven hundred eighty-one".