123133352520 has 128 divisors (see below), whose sum is σ = 371187100800. Its totient is φ = 32677103616.

The previous prime is 123133352509. The next prime is 123133352543. The reversal of 123133352520 is 25253331321.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23690562 + ... + 23695758.

It is an arithmetic number, because the mean of its divisors is an integer number (2899899225).

Almost surely, 2^123133352520 is an apocalyptic number.

123133352520 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 123133352520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185593550400).

123133352520 is an abundant number, since it is smaller than the sum of its proper divisors (248053748280).

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

123133352520 is a wasteful number, since it uses less digits than its factorization.

123133352520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127 (or 6123 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 123133352520 its reverse (25253331321), we get a palindrome (148386683841).

The spelling of 123133352520 in words is "one hundred twenty-three billion, one hundred thirty-three million, three hundred fifty-two thousand, five hundred twenty".