126666525 has 12 divisors (see below), whose sum is σ = 209422112. Its totient is φ = 67555440.

The previous prime is 126666523. The next prime is 126666557. The reversal of 126666525 is 525666621.

It is a happy number.

It is not a de Polignac number, because 126666525 - 2¹ = 126666523 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126666523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 844369 + ... + 844518.

Almost surely, 2^126666525 is an apocalyptic number.

126666525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126666525 is a deficient number, since it is larger than the sum of its proper divisors (82755587).

126666525 is a wasteful number, since it uses less digits than its factorization.

126666525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688900 (or 1688895 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 126666525 is about 11254.6223837142. The cubic root of 126666525 is about 502.2122309662.

It can be divided in two parts, 12666 and 6525, that added together give a palindrome (19191).

The spelling of 126666525 in words is "one hundred twenty-six million, six hundred sixty-six thousand, five hundred twenty-five".