125517066435665 has 4 divisors (see below), whose sum is σ = 150620479722804. Its totient is φ = 100413653148528.

The previous prime is 125517066435641. The next prime is 125517066435671. The reversal of 125517066435665 is 566534660715521.

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 32707041066049 + 92810025369616 = 5719007^2 + 9633796^2 .

It is a cyclic number.

It is not a de Polignac number, because 125517066435665 - 2²⁰ = 125517065387089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125517066435598 and 125517066435607.

It is an unprimeable number.

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, 12551706643562 + ... + 12551706643571.

It is an arithmetic number, because the mean of its divisors is an integer number (37655119930701).

Almost surely, 2^{125517066435665} is an apocalyptic number.

It is an amenable number.

125517066435665 is a deficient number, since it is larger than the sum of its proper divisors (25103413287139).

125517066435665 is an equidigital number, since it uses as much as digits as its factorization.

125517066435665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25103413287138.

The product of its (nonzero) digits is 136080000, while the sum is 62.

The spelling of 125517066435665 in words is "one hundred twenty-five trillion, five hundred seventeen billion, sixty-six million, four hundred thirty-five thousand, six hundred sixty-five".