12185517550 has 24 divisors (see below), whose sum is σ = 23998303296. Its totient is φ = 4587488640.

The previous prime is 12185517523. The next prime is 12185517559. The reversal of 12185517550 is 5571558121.

It is a super-2 number, since 2×12185517550² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12185517559) 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 11 ways as a sum of consecutive naturals, for example, 7167102 + ... + 7168801.

It is an arithmetic number, because the mean of its divisors is an integer number (999929304).

Almost surely, 2^12185517550 is an apocalyptic number.

12185517550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12185517550 is a deficient number, since it is larger than the sum of its proper divisors (11812785746).

12185517550 is a wasteful number, since it uses less digits than its factorization.

12185517550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14335932 (or 14335927 counting only the distinct ones).

The product of its (nonzero) digits is 70000, while the sum is 40.

The spelling of 12185517550 in words is "twelve billion, one hundred eighty-five million, five hundred seventeen thousand, five hundred fifty".