125011210261 has 6 divisors (see below), whose sum is σ = 145421203830. Its totient is φ = 107152465896.

The previous prime is 125011210243. The next prime is 125011210271. The reversal of 125011210261 is 162012110521.

It can be written as a sum of positive squares in only one way, i.e., 79778002500 + 45233207761 = 282450^2 + 212681^2 .

It is not a de Polignac number, because 125011210261 - 2¹⁵ = 125011177493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125011210271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1275624546 + ... + 1275624643.

It is an arithmetic number, because the mean of its divisors is an integer number (24236867305).

Almost surely, 2^125011210261 is an apocalyptic number.

It is an amenable number.

125011210261 is a deficient number, since it is larger than the sum of its proper divisors (20409993569).

125011210261 is an equidigital number, since it uses as much as digits as its factorization.

125011210261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551249203 (or 2551249196 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 125011210261 its reverse (162012110521), we get a palindrome (287023320782).

The spelling of 125011210261 in words is "one hundred twenty-five billion, eleven million, two hundred ten thousand, two hundred sixty-one".