155223180 has 108 divisors (see below), whose sum is σ = 547747200. Its totient is φ = 35477568.

The previous prime is 155223161. The next prime is 155223203. The reversal of 155223180 is 81322551.

It is a happy number.

155223180 is a `hidden beast` number, since 1 + 552 + 2 + 31 + 80 = 666.

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, 21 + ... + 17619.

Almost surely, 2^155223180 is an apocalyptic number.

155223180 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 155223180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273873600).

155223180 is an abundant number, since it is smaller than the sum of its proper divisors (392524020).

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

155223180 is a wasteful number, since it uses less digits than its factorization.

155223180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17628 (or 17616 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 155223180 is about 12458.8594983650. The cubic root of 155223180 is about 537.4262296449.

It can be divided in two parts, 155223 and 180, that added together give a triangular number (155403 = T₅₅₇).

The spelling of 155223180 in words is "one hundred fifty-five million, two hundred twenty-three thousand, one hundred eighty".