2125266561 has 24 divisors (see below), whose sum is σ = 3358555200. Its totient is φ = 1284328800.

The previous prime is 2125266547. The next prime is 2125266571. The reversal of 2125266561 is 1656625212.

2125266561 is a `hidden beast` number, since 2 + 12 + 526 + 65 + 61 = 666.

It is not a de Polignac number, because 2125266561 - 2¹⁰ = 2125265537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2125266541) 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 23 ways as a sum of consecutive naturals, for example, 3796 + ... + 65306.

It is an arithmetic number, because the mean of its divisors is an integer number (139939800).

Almost surely, 2^2125266561 is an apocalyptic number.

It is an amenable number.

2125266561 is a deficient number, since it is larger than the sum of its proper divisors (1233288639).

2125266561 is a wasteful number, since it uses less digits than its factorization.

2125266561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61877 (or 61874 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 2125266561 is about 46100.6134557882. The cubic root of 2125266561 is about 1285.6945502103.

The spelling of 2125266561 in words is "two billion, one hundred twenty-five million, two hundred sixty-six thousand, five hundred sixty-one".