123001553444 has 144 divisors (see below), whose sum is σ = 285082984704. Its totient is φ = 45363732480.

The previous prime is 123001553413. The next prime is 123001553453. The reversal of 123001553444 is 444355100321.

It is a super-2 number, since 2×123001553444² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123001553444.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7550492 + ... + 7566764.

Almost surely, 2^123001553444 is an apocalyptic number.

123001553444 is a gapful number since it is divisible by the number (14) 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 123001553444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142541492352).

123001553444 is an abundant number, since it is smaller than the sum of its proper divisors (162081431260).

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

123001553444 is a wasteful number, since it uses less digits than its factorization.

123001553444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16426 (or 16413 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 123001553444 its reverse (444355100321), we get a palindrome (567356653765).

The spelling of 123001553444 in words is "one hundred twenty-three billion, one million, five hundred fifty-three thousand, four hundred forty-four".