123528951855 has 16 divisors (see below), whose sum is σ = 219607025760.
Its totient is φ = 65882107584.
The previous prime is 123528951817. The next prime is 123528951859. The reversal of 123528951855 is 558159825321.
123528951855 is a `hidden beast` number, since 1 + 23 + 52 + 8 + 9 + 518 + 55 = 666.
It is not a de Polignac number, because 123528951855 - 27 = 123528951727 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (123528951859) by changing a digit.
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 15 ways as a sum of consecutive naturals, for example, 457514502 + ... + 457514771.
It is an arithmetic number, because the mean of its divisors is an integer number (13725439110).
Almost surely, 2123528951855 is an apocalyptic number.
123528951855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
123528951855 is a deficient number, since it is larger than the sum of its proper divisors (96078073905).
123528951855 is an equidigital number, since it uses as much as digits as its factorization.
123528951855 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 915029287 (or 915029281 counting only the distinct ones).
The product of its digits is 4320000, while the sum is 54.
The spelling of 123528951855 in words is "one hundred twenty-three billion, five hundred twenty-eight million, nine hundred fifty-one thousand, eight hundred fifty-five".