266120812125 has 224 divisors, whose sum is σ = 576398883840. Its totient is φ = 120092544000.

The previous prime is 266120812103. The next prime is 266120812151. The reversal of 266120812125 is 521218021662.

266120812125 is a `hidden beast` number, since 2 + 6 + 612 + 0 + 8 + 12 + 1 + 25 = 666.

It is not a de Polignac number, because 266120812125 - 2¹⁵ = 266120779357 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 266120812125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 50389485 + ... + 50394765.

Almost surely, 2^266120812125 is an apocalyptic number.

266120812125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

266120812125 is an abundant number, since it is smaller than the sum of its proper divisors (310278071715).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266120812125 is an frugal number, since it uses more digits than its factorization.

266120812125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5400 (or 5375 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

Adding to 266120812125 its reverse (521218021662), we get a palindrome (787338833787).

The spelling of 266120812125 in words is "two hundred sixty-six billion, one hundred twenty million, eight hundred twelve thousand, one hundred twenty-five".