125523655261 has 4 divisors (see below), whose sum is σ = 126934033500. Its totient is φ = 124113277024.

The previous prime is 125523655237. The next prime is 125523655273. The reversal of 125523655261 is 162556325521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162556325521 = 23 ⋅7067666327.

It can be written as a sum of positive squares in 2 ways, for example, as 26923887225 + 98599768036 = 164085^2 + 314006^2 .

It is a cyclic number.

It is not a de Polignac number, because 125523655261 - 2¹⁹ = 125523130973 is a prime.

It is a super-3 number, since 3×125523655261³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125523655561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705188986 + ... + 705189163.

It is an arithmetic number, because the mean of its divisors is an integer number (31733508375).

Almost surely, 2^125523655261 is an apocalyptic number.

It is an amenable number.

125523655261 is a deficient number, since it is larger than the sum of its proper divisors (1410378239).

125523655261 is an equidigital number, since it uses as much as digits as its factorization.

125523655261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410378238.

The product of its digits is 540000, while the sum is 43.

The spelling of 125523655261 in words is "one hundred twenty-five billion, five hundred twenty-three million, six hundred fifty-five thousand, two hundred sixty-one".