123145422500 has 60 divisors (see below), whose sum is σ = 271678169532. Its totient is φ = 48822144000.

The previous prime is 123145422467. The next prime is 123145422529. The reversal of 123145422500 is 5224541321.

It can be written as a sum of positive squares in 10 ways, for example, as 122858662144 + 286760356 = 350512^2 + 16934^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64544 + ... + 500456.

Almost surely, 2^123145422500 is an apocalyptic number.

123145422500 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 123145422500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135839084766).

123145422500 is an abundant number, since it is smaller than the sum of its proper divisors (148532747032).

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

123145422500 is a wasteful number, since it uses less digits than its factorization.

123145422500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436050 (or 436033 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 123145422500 its reverse (5224541321), we get a palindrome (128369963821).

The spelling of 123145422500 in words is "one hundred twenty-three billion, one hundred forty-five million, four hundred twenty-two thousand, five hundred".