126378617609 has 2 divisors, whose sum is σ = 126378617610. Its totient is φ = 126378617608.

The previous prime is 126378617543. The next prime is 126378617639. The reversal of 126378617609 is 906716873621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112377811984 + 14000805625 = 335228^2 + 118325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126378617609 is a prime.

It is not a weakly prime, because it can be changed into another prime (126378617639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63189308804 + 63189308805.

It is an arithmetic number, because the mean of its divisors is an integer number (63189308805).

Almost surely, 2^126378617609 is an apocalyptic number.

It is an amenable number.

126378617609 is a deficient number, since it is larger than the sum of its proper divisors (1).

126378617609 is an equidigital number, since it uses as much as digits as its factorization.

126378617609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 126378617609 in words is "one hundred twenty-six billion, three hundred seventy-eight million, six hundred seventeen thousand, six hundred nine".