125623661525 has 6 divisors (see below), whose sum is σ = 155773340322. Its totient is φ = 100498929200.

The previous prime is 125623661491. The next prime is 125623661531. The reversal of 125623661525 is 525166326521.

It can be written as a sum of positive squares in 3 ways, for example, as 28583312356 + 97040349169 = 169066^2 + 311513^2 .

It is not a de Polignac number, because 125623661525 - 2¹⁴ = 125623645141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2512473206 + ... + 2512473255.

It is an arithmetic number, because the mean of its divisors is an integer number (25962223387).

Almost surely, 2^125623661525 is an apocalyptic number.

It is an amenable number.

125623661525 is a deficient number, since it is larger than the sum of its proper divisors (30149678797).

125623661525 is an equidigital number, since it uses as much as digits as its factorization.

125623661525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5024946471 (or 5024946466 counting only the distinct ones).

The product of its digits is 648000, while the sum is 44.

The spelling of 125623661525 in words is "one hundred twenty-five billion, six hundred twenty-three million, six hundred sixty-one thousand, five hundred twenty-five".