12403123352505 has 96 divisors (see below), whose sum is σ = 21816243540000. Its totient is φ = 6517865840640.

The previous prime is 12403123352497. The next prime is 12403123352507. The reversal of 12403123352505 is 50525332130421.

12403123352505 is a `hidden beast` number, since 1 + 2 + 4 + 0 + 3 + 123 + 3 + 525 + 0 + 5 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 8299861378704 + 4103261973801 = 2880948^2 + 2025651^2 .

It is not a de Polignac number, because 12403123352505 - 2³ = 12403123352497 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12403123352505.

It is not an unprimeable number, because it can be changed into a prime (12403123352507) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1584249931 + ... + 1584257759.

It is an arithmetic number, because the mean of its divisors is an integer number (227252536875).

Almost surely, 2^{12403123352505} is an apocalyptic number.

12403123352505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12403123352505 is a deficient number, since it is larger than the sum of its proper divisors (9413120187495).

12403123352505 is a wasteful number, since it uses less digits than its factorization.

12403123352505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9259 (or 9256 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 12403123352505 its reverse (50525332130421), we get a palindrome (62928455482926).

The spelling of 12403123352505 in words is "twelve trillion, four hundred three billion, one hundred twenty-three million, three hundred fifty-two thousand, five hundred five".