155244452220 has 288 divisors, whose sum is σ = 562309884864. Its totient is φ = 34170163200.

The previous prime is 155244452137. The next prime is 155244452243. The reversal of 155244452220 is 22254442551.

155244452220 is a `hidden beast` number, since 1 + 55 + 24 + 44 + 522 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 95 ways as a sum of consecutive naturals, for example, 1520704 + ... + 1619576.

It is an arithmetic number, because the mean of its divisors is an integer number (1952464878).

Almost surely, 2^155244452220 is an apocalyptic number.

155244452220 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 155244452220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281154942432).

155244452220 is an abundant number, since it is smaller than the sum of its proper divisors (407065432644).

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

155244452220 is a wasteful number, since it uses less digits than its factorization.

155244452220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98973 (or 98968 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 36.

Adding to 155244452220 its reverse (22254442551), we get a palindrome (177498894771).

The spelling of 155244452220 in words is "one hundred fifty-five billion, two hundred forty-four million, four hundred fifty-two thousand, two hundred twenty".