125663910389 has 4 divisors (see below), whose sum is σ = 125666418924. Its totient is φ = 125661401856.

The previous prime is 125663910373. The next prime is 125663910391. The reversal of 125663910389 is 983019366521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121510107889 + 4153802500 = 348583^2 + 64450^2 .

It is a cyclic number.

It is not a de Polignac number, because 125663910389 - 2⁴ = 125663910373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125663910389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125663910319) 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 in 3 ways as a sum of consecutive naturals, for example, 1177562 + ... + 1279835.

It is an arithmetic number, because the mean of its divisors is an integer number (31416604731).

Almost surely, 2^125663910389 is an apocalyptic number.

It is an amenable number.

125663910389 is a deficient number, since it is larger than the sum of its proper divisors (2508535).

125663910389 is an equidigital number, since it uses as much as digits as its factorization.

125663910389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2508534.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 125663910389 in words is "one hundred twenty-five billion, six hundred sixty-three million, nine hundred ten thousand, three hundred eighty-nine".