123255405443340 has 240 divisors, whose sum is σ = 392748598674432. Its totient is φ = 32354088764544.

The previous prime is 123255405443323. The next prime is 123255405443389. The reversal of 123255405443340 is 43344504552321.

123255405443340 is a `hidden beast` number, since 1 + 2 + 3 + 2 + 554 + 0 + 54 + 4 + 3 + 3 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 25654017 + ... + 30077223.

Almost surely, 2^{123255405443340} is an apocalyptic number.

123255405443340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123255405443340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196374299337216).

123255405443340 is an abundant number, since it is smaller than the sum of its proper divisors (269493193231092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123255405443340 is a wasteful number, since it uses less digits than its factorization.

123255405443340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423498 (or 4423487 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 45.

Adding to 123255405443340 its reverse (43344504552321), we get a palindrome (166599909995661).

The spelling of 123255405443340 in words is "one hundred twenty-three trillion, two hundred fifty-five billion, four hundred five million, four hundred forty-three thousand, three hundred forty".