125663664065 has 8 divisors (see below), whose sum is σ = 154871975400. Its totient is φ = 97813878912.

The previous prime is 125663664023. The next prime is 125663664089. The reversal of 125663664065 is 560466366521.

It can be written as a sum of positive squares in 4 ways, for example, as 21185384704 + 104478279361 = 145552^2 + 323231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125663664065 - 2⁸ = 125663663809 is a prime.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 339631340 + ... + 339631709.

It is an arithmetic number, because the mean of its divisors is an integer number (19358996925).

Almost surely, 2^125663664065 is an apocalyptic number.

It is an amenable number.

125663664065 is a deficient number, since it is larger than the sum of its proper divisors (29208311335).

125663664065 is an equidigital number, since it uses as much as digits as its factorization.

125663664065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679263091.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 125663664065 in words is "one hundred twenty-five billion, six hundred sixty-three million, six hundred sixty-four thousand, sixty-five".