123653421552 has 160 divisors (see below), whose sum is σ = 336183840000. Its totient is φ = 39109238784.

The previous prime is 123653421473. The next prime is 123653421553. The reversal of 123653421552 is 255124356321.

It is a self number, because there is not a number n which added to its sum of digits gives 123653421552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123653421553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46537408 + ... + 46540064.

It is an arithmetic number, because the mean of its divisors is an integer number (2101149000).

Almost surely, 2^123653421552 is an apocalyptic number.

123653421552 is a gapful number since it is divisible by the number (12) 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 123653421552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168091920000).

123653421552 is an abundant number, since it is smaller than the sum of its proper divisors (212530418448).

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

123653421552 is a wasteful number, since it uses less digits than its factorization.

123653421552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263 (or 3257 counting only the distinct ones).

The product of its digits is 216000, while the sum is 39.

Adding to 123653421552 its reverse (255124356321), we get a palindrome (378777777873).

The spelling of 123653421552 in words is "one hundred twenty-three billion, six hundred fifty-three million, four hundred twenty-one thousand, five hundred fifty-two".