12401423550 has 72 divisors (see below), whose sum is σ = 33353311680. Its totient is φ = 3303590400.

The previous prime is 12401423513. The next prime is 12401423569. The reversal of 12401423550 is 5532410421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 432046 + ... + 459854.

It is an arithmetic number, because the mean of its divisors is an integer number (463240440).

Almost surely, 2^12401423550 is an apocalyptic number.

12401423550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12401423550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16676655840).

12401423550 is an abundant number, since it is smaller than the sum of its proper divisors (20951888130).

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

12401423550 is a wasteful number, since it uses less digits than its factorization.

12401423550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28818 (or 28810 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 12401423550 its reverse (5532410421), we get a palindrome (17933833971).

The spelling of 12401423550 in words is "twelve billion, four hundred one million, four hundred twenty-three thousand, five hundred fifty".