12155622566 has 4 divisors (see below), whose sum is σ = 18233433852. Its totient is φ = 6077811282.

The previous prime is 12155622547. The next prime is 12155622569. The reversal of 12155622566 is 66522655121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155622569) 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 as a sum of consecutive naturals, namely, 3038905640 + ... + 3038905643.

It is an arithmetic number, because the mean of its divisors is an integer number (4558358463).

Almost surely, 2^12155622566 is an apocalyptic number.

12155622566 is a deficient number, since it is larger than the sum of its proper divisors (6077811286).

12155622566 is an equidigital number, since it uses as much as digits as its factorization.

12155622566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6077811285.

The product of its digits is 216000, while the sum is 41.

The spelling of 12155622566 in words is "twelve billion, one hundred fifty-five million, six hundred twenty-two thousand, five hundred sixty-six".