123405053503 has 8 divisors (see below), whose sum is σ = 124046899200. Its totient is φ = 122763425400.

The previous prime is 123405053489. The next prime is 123405053509. The reversal of 123405053503 is 305350504321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123405053503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123405053509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1152078 + ... + 1254628.

It is an arithmetic number, because the mean of its divisors is an integer number (15505862400).

Almost surely, 2^123405053503 is an apocalyptic number.

123405053503 is a deficient number, since it is larger than the sum of its proper divisors (641845697).

123405053503 is a wasteful number, since it uses less digits than its factorization.

123405053503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108797.

The product of its (nonzero) digits is 27000, while the sum is 31.

Adding to 123405053503 its reverse (305350504321), we get a palindrome (428755557824).

The spelling of 123405053503 in words is "one hundred twenty-three billion, four hundred five million, fifty-three thousand, five hundred three".