123435440505 has 96 divisors (see below), whose sum is σ = 246337168896. Its totient is φ = 56637868032.

The previous prime is 123435440497. The next prime is 123435440507. The reversal of 123435440505 is 505044534321.

123435440505 is a `hidden beast` number, since 1 + 23 + 43 + 54 + 40 + 505 = 666.

It is not a de Polignac number, because 123435440505 - 2³ = 123435440497 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 123435440505.

It is not an unprimeable number, because it can be changed into a prime (123435440507) 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, 964084 + ... + 1084586.

It is an arithmetic number, because the mean of its divisors is an integer number (2566012176).

Almost surely, 2^123435440505 is an apocalyptic number.

123435440505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123435440505 is a deficient number, since it is larger than the sum of its proper divisors (122901728391).

123435440505 is a wasteful number, since it uses less digits than its factorization.

123435440505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120647 (or 120644 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 123435440505 its reverse (505044534321), we get a palindrome (628479974826).

The spelling of 123435440505 in words is "one hundred twenty-three billion, four hundred thirty-five million, four hundred forty thousand, five hundred five".