155205580 has 48 divisors (see below), whose sum is σ = 346187520. Its totient is φ = 58247168.

The previous prime is 155205559. The next prime is 155205629. The reversal of 155205580 is 85502551.

It is a super-3 number, since 3×155205580³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162384 + ... + 163336.

It is an arithmetic number, because the mean of its divisors is an integer number (7212240).

Almost surely, 2^155205580 is an apocalyptic number.

155205580 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 155205580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173093760).

155205580 is an abundant number, since it is smaller than the sum of its proper divisors (190981940).

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

155205580 is a wasteful number, since it uses less digits than its factorization.

155205580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 31.

The square root of 155205580 is about 12458.1531536580. The cubic root of 155205580 is about 537.4059168301.

The spelling of 155205580 in words is "one hundred fifty-five million, two hundred five thousand, five hundred eighty".