126378617543 has 2 divisors, whose sum is σ = 126378617544. Its totient is φ = 126378617542.

The previous prime is 126378617539. The next prime is 126378617609. The reversal of 126378617543 is 345716873621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126378617543 - 2² = 126378617539 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126378617243) 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, 63189308771 + 63189308772.

It is an arithmetic number, because the mean of its divisors is an integer number (63189308772).

Almost surely, 2^126378617543 is an apocalyptic number.

126378617543 is a deficient number, since it is larger than the sum of its proper divisors (1).

126378617543 is an equidigital number, since it uses as much as digits as its factorization.

126378617543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 53.

The spelling of 126378617543 in words is "one hundred twenty-six billion, three hundred seventy-eight million, six hundred seventeen thousand, five hundred forty-three".