123501143550 has 144 divisors (see below), whose sum is σ = 329242520880. Its totient is φ = 30530903040.

The previous prime is 123501143543. The next prime is 123501143593. The reversal of 123501143550 is 55341105321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 11441556 + ... + 11452344.

It is an arithmetic number, because the mean of its divisors is an integer number (2286406395).

Almost surely, 2^123501143550 is an apocalyptic number.

123501143550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123501143550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164621260440).

123501143550 is an abundant number, since it is smaller than the sum of its proper divisors (205741377330).

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

123501143550 is a wasteful number, since it uses less digits than its factorization.

123501143550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10955 (or 10883 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 123501143550 its reverse (55341105321), we get a palindrome (178842248871).

The spelling of 123501143550 in words is "one hundred twenty-three billion, five hundred one million, one hundred forty-three thousand, five hundred fifty".