123668855520 has 768 divisors, whose sum is σ = 490386161664. Its totient is φ = 25546752000.

The previous prime is 123668855437. The next prime is 123668855533. The reversal of 123668855520 is 25558866321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 373621755 + ... + 373622085.

It is an arithmetic number, because the mean of its divisors is an integer number (638523648).

Almost surely, 2^123668855520 is an apocalyptic number.

123668855520 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 123668855520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245193080832).

123668855520 is an abundant number, since it is smaller than the sum of its proper divisors (366717306144).

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

123668855520 is a wasteful number, since it uses less digits than its factorization.

123668855520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 51.

The spelling of 123668855520 in words is "one hundred twenty-three billion, six hundred sixty-eight million, eight hundred fifty-five thousand, five hundred twenty".