123543507555 has 128 divisors (see below), whose sum is σ = 238287329280. Its totient is φ = 60371136000.

The previous prime is 123543507541. The next prime is 123543507557. The reversal of 123543507555 is 555705345321.

123543507555 is a `hidden beast` number, since 1 + 2 + 3 + 5 + 43 + 50 + 7 + 555 = 666.

It is not a de Polignac number, because 123543507555 - 2²⁶ = 123476398691 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 123543507555.

It is not an unprimeable number, because it can be changed into a prime (123543507557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 251615860 + ... + 251616350.

It is an arithmetic number, because the mean of its divisors is an integer number (1861619760).

Almost surely, 2^123543507555 is an apocalyptic number.

123543507555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123543507555 is a deficient number, since it is larger than the sum of its proper divisors (114743821725).

123543507555 is a wasteful number, since it uses less digits than its factorization.

123543507555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 1575000, while the sum is 45.

The spelling of 123543507555 in words is "one hundred twenty-three billion, five hundred forty-three million, five hundred seven thousand, five hundred fifty-five".