125663856859 has 2 divisors, whose sum is σ = 125663856860. Its totient is φ = 125663856858.

The previous prime is 125663856853. The next prime is 125663856937. The reversal of 125663856859 is 958658366521.

It is a weak prime.

It is an emirp because it is prime and its reverse (958658366521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125663856859 - 2⁹ = 125663856347 is a prime.

It is a super-3 number, since 3×125663856859³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 125663856859.

It is not a weakly prime, because it can be changed into another prime (125663856853) 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, 62831928429 + 62831928430.

It is an arithmetic number, because the mean of its divisors is an integer number (62831928430).

Almost surely, 2^125663856859 is an apocalyptic number.

125663856859 is a deficient number, since it is larger than the sum of its proper divisors (1).

125663856859 is an equidigital number, since it uses as much as digits as its factorization.

125663856859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312000, while the sum is 64.

The spelling of 125663856859 in words is "one hundred twenty-five billion, six hundred sixty-three million, eight hundred fifty-six thousand, eight hundred fifty-nine".