12205600155 has 64 divisors (see below), whose sum is σ = 24936038400. Its totient is φ = 5548798080.

The previous prime is 12205600129. The next prime is 12205600157. The reversal of 12205600155 is 55100650221.

12205600155 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 5 + 600 + 1 + 55 = 666.

It is not a de Polignac number, because 12205600155 - 2⁵ = 12205600123 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (12205600157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 135366 + ... + 206724.

It is an arithmetic number, because the mean of its divisors is an integer number (389625600).

Almost surely, 2^12205600155 is an apocalyptic number.

12205600155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12205600155 is an abundant number, since it is smaller than the sum of its proper divisors (12730438245).

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

12205600155 is a wasteful number, since it uses less digits than its factorization.

12205600155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71561 (or 71555 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 12205600155 in words is "twelve billion, two hundred five million, six hundred thousand, one hundred fifty-five".