126782503781 has 2 divisors, whose sum is σ = 126782503782. Its totient is φ = 126782503780.

The previous prime is 126782503769. The next prime is 126782503843. The reversal of 126782503781 is 187305287621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118071268225 + 8711235556 = 343615^2 + 93334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126782503781 is a prime.

It is a super-2 number, since 2×126782503781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126782503721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63391251890 + 63391251891.

It is an arithmetic number, because the mean of its divisors is an integer number (63391251891).

Almost surely, 2^126782503781 is an apocalyptic number.

It is an amenable number.

126782503781 is a deficient number, since it is larger than the sum of its proper divisors (1).

126782503781 is an equidigital number, since it uses as much as digits as its factorization.

126782503781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 126782503781 in words is "one hundred twenty-six billion, seven hundred eighty-two million, five hundred three thousand, seven hundred eighty-one".