155224141440 has 128 divisors (see below), whose sum is σ = 497368581120. Its totient is φ = 41176289280.

The previous prime is 155224141417. The next prime is 155224141441. The reversal of 155224141440 is 44141422551.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (155224141441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155082 + ... + 578358.

It is an arithmetic number, because the mean of its divisors is an integer number (3885692040).

Almost surely, 2^155224141440 is an apocalyptic number.

155224141440 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 155224141440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248684290560).

155224141440 is an abundant number, since it is smaller than the sum of its proper divisors (342144439680).

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

155224141440 is a wasteful number, since it uses less digits than its factorization.

155224141440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423490 (or 423478 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 33.

Adding to 155224141440 its reverse (44141422551), we get a palindrome (199365563991).

The spelling of 155224141440 in words is "one hundred fifty-five billion, two hundred twenty-four million, one hundred forty-one thousand, four hundred forty".