155320735028220 has 336 divisors, whose sum is σ = 490973274620640. Its totient is φ = 41255073446400.

The previous prime is 155320735028209. The next prime is 155320735028227. The reversal of 155320735028220 is 22820537023551.

155320735028220 is a `hidden beast` number, since 1 + 5 + 53 + 2 + 0 + 7 + 350 + 28 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155320735028227) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 5351997310 + ... + 5352026330.

It is an arithmetic number, because the mean of its divisors is an integer number (1461229983990).

Almost surely, 2^{155320735028220} is an apocalyptic number.

155320735028220 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 155320735028220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245486637310320).

155320735028220 is an abundant number, since it is smaller than the sum of its proper divisors (335652539592420).

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

155320735028220 is a wasteful number, since it uses less digits than its factorization.

155320735028220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30488 (or 30471 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 155320735028220 in words is "one hundred fifty-five trillion, three hundred twenty billion, seven hundred thirty-five million, twenty-eight thousand, two hundred twenty".