12156140205 has 320 divisors, whose sum is σ = 26495631360. Its totient is φ = 5269017600.

The previous prime is 12156140203. The next prime is 12156140231. The reversal of 12156140205 is 50204165121.

12156140205 is a `hidden beast` number, since 1 + 21 + 5 + 614 + 0 + 20 + 5 = 666.

It is not a de Polignac number, because 12156140205 - 2¹ = 12156140203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156140203) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 136585801 + ... + 136585889.

It is an arithmetic number, because the mean of its divisors is an integer number (82798848).

Almost surely, 2^12156140205 is an apocalyptic number.

12156140205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12156140205 is an abundant number, since it is smaller than the sum of its proper divisors (14339491155).

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

12156140205 is a wasteful number, since it uses less digits than its factorization.

12156140205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 12156140205 in words is "twelve billion, one hundred fifty-six million, one hundred forty thousand, two hundred five".