123203869211808 has 864 divisors, whose sum is σ = 488203849643328. Its totient is φ = 30118575513600.

The previous prime is 123203869211737. The next prime is 123203869211827. The reversal of 123203869211808 is 808112968302321.

123203869211808 is a `hidden beast` number, since 1 + 23 + 20 + 386 + 9 + 211 + 8 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 143 ways as a sum of consecutive naturals, for example, 70386918 + ... + 72116058.

It is an arithmetic number, because the mean of its divisors is an integer number (565050751902).

Almost surely, 2^{123203869211808} is an apocalyptic number.

123203869211808 is a gapful number since it is divisible by the number (18) 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 123203869211808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244101924821664).

123203869211808 is an abundant number, since it is smaller than the sum of its proper divisors (364999980431520).

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

123203869211808 is a wasteful number, since it uses less digits than its factorization.

123203869211808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729208 (or 1729181 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 123203869211808 in words is "one hundred twenty-three trillion, two hundred three billion, eight hundred sixty-nine million, two hundred eleven thousand, eight hundred eight".