12155203455 has 8 divisors (see below), whose sum is σ = 19448325552. Its totient is φ = 6482775168.

The previous prime is 12155203427. The next prime is 12155203523. The reversal of 12155203455 is 55430255121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12155203455 - 2¹⁹ = 12154679167 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405173434 + ... + 405173463.

It is an arithmetic number, because the mean of its divisors is an integer number (2431040694).

Almost surely, 2^12155203455 is an apocalyptic number.

12155203455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12155203455 is a deficient number, since it is larger than the sum of its proper divisors (7293122097).

12155203455 is an equidigital number, since it uses as much as digits as its factorization.

12155203455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810346905.

The product of its (nonzero) digits is 30000, while the sum is 33.

Adding to 12155203455 its reverse (55430255121), we get a palindrome (67585458576).

The spelling of 12155203455 in words is "twelve billion, one hundred fifty-five million, two hundred three thousand, four hundred fifty-five".