126681252525 has 18 divisors (see below), whose sum is σ = 226900199370. Its totient is φ = 67563334560.

The previous prime is 126681252469. The next prime is 126681252539. The reversal of 126681252525 is 525252186621.

126681252525 is a `hidden beast` number, since 1 + 2 + 6 + 68 + 12 + 52 + 525 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 3686554089 + 122994698436 = 60717^2 + 350706^2 .

It is not a de Polignac number, because 126681252525 - 2⁶ = 126681252461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 281513670 + ... + 281514119.

Almost surely, 2^126681252525 is an apocalyptic number.

126681252525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126681252525 is a deficient number, since it is larger than the sum of its proper divisors (100218946845).

126681252525 is a wasteful number, since it uses less digits than its factorization.

126681252525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563027805 (or 563027797 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The spelling of 126681252525 in words is "one hundred twenty-six billion, six hundred eighty-one million, two hundred fifty-two thousand, five hundred twenty-five".