125511522242 has 18 divisors (see below), whose sum is σ = 194560405497. Its totient is φ = 60723866400.

The previous prime is 125511522217. The next prime is 125511522251. The reversal of 125511522242 is 242225115521.

It can be written as a sum of positive squares in 2 ways, for example, as 122254423201 + 3257099041 = 349649^2 + 57071^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=250511.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125511522199 and 125511522208.

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 8 ways as a sum of consecutive naturals, for example, 15527642 + ... + 15535722.

Almost surely, 2^125511522242 is an apocalyptic number.

125511522242 is a deficient number, since it is larger than the sum of its proper divisors (69048883255).

125511522242 is an frugal number, since it uses more digits than its factorization.

125511522242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16226 (or 8114 counting only the distinct ones).

The product of its digits is 16000, while the sum is 32.

Multiplying 125511522242 by its sum of digits (32), we get a square (4016368711744 = 2004088²).

Adding to 125511522242 its reverse (242225115521), we get a palindrome (367736637763).

The spelling of 125511522242 in words is "one hundred twenty-five billion, five hundred eleven million, five hundred twenty-two thousand, two hundred forty-two".