155644432244 has 48 divisors (see below), whose sum is σ = 325112390400. Its totient is φ = 63747737856.

The previous prime is 155644432241. The next prime is 155644432259. The reversal of 155644432244 is 442234446551.

It is a junction number, because it is equal to n+sod(n) for n = 155644432195 and 155644432204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155644432241) 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, 620042 + ... + 834110.

It is an arithmetic number, because the mean of its divisors is an integer number (6773174800).

Almost surely, 2^155644432244 is an apocalyptic number.

155644432244 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 155644432244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162556195200).

155644432244 is an abundant number, since it is smaller than the sum of its proper divisors (169467958156).

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

155644432244 is a wasteful number, since it uses less digits than its factorization.

155644432244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215232 (or 215230 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 44.

Adding to 155644432244 its reverse (442234446551), we get a palindrome (597878878795).

The spelling of 155644432244 in words is "one hundred fifty-five billion, six hundred forty-four million, four hundred thirty-two thousand, two hundred forty-four".