123512522022440 has 128 divisors (see below), whose sum is σ = 286161043069440. Its totient is φ = 47951552952576.

The previous prime is 123512522022359. The next prime is 123512522022479. The reversal of 123512522022440 is 44220225215321.

It is a self number, because there is not a number n which added to its sum of digits gives 123512522022440.

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, 1727822939 + ... + 1727894421.

It is an arithmetic number, because the mean of its divisors is an integer number (2235633148980).

Almost surely, 2^{123512522022440} is an apocalyptic number.

123512522022440 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 123512522022440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143080521534720).

123512522022440 is an abundant number, since it is smaller than the sum of its proper divisors (162648521047000).

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

123512522022440 is a wasteful number, since it uses less digits than its factorization.

123512522022440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77863 (or 77859 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 123512522022440 its reverse (44220225215321), we get a palindrome (167732747237761).

The spelling of 123512522022440 in words is "one hundred twenty-three trillion, five hundred twelve billion, five hundred twenty-two million, twenty-two thousand, four hundred forty".