12155265287 has 4 divisors (see below), whose sum is σ = 13260289416. Its totient is φ = 11050241160.

The previous prime is 12155265229. The next prime is 12155265289. The reversal of 12155265287 is 78256255121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12155265287 - 2¹⁰ = 12155264263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155265289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552512048 + ... + 552512069.

It is an arithmetic number, because the mean of its divisors is an integer number (3315072354).

Almost surely, 2^12155265287 is an apocalyptic number.

12155265287 is a deficient number, since it is larger than the sum of its proper divisors (1105024129).

12155265287 is a wasteful number, since it uses less digits than its factorization.

12155265287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105024128.

The product of its digits is 336000, while the sum is 44.

The spelling of 12155265287 in words is "twelve billion, one hundred fifty-five million, two hundred sixty-five thousand, two hundred eighty-seven".