155605266 has 64 divisors (see below), whose sum is σ = 355810560. Its totient is φ = 50388480.

The previous prime is 155605259. The next prime is 155605283. The reversal of 155605266 is 662506551.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155605266.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319275 + ... + 319761.

It is an arithmetic number, because the mean of its divisors is an integer number (5559540).

Almost surely, 2^155605266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155605266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177905280).

155605266 is an abundant number, since it is smaller than the sum of its proper divisors (200205294).

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

155605266 is a wasteful number, since it uses less digits than its factorization.

155605266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 155605266 is about 12474.1839813272. The cubic root of 155605266 is about 537.8668313270.

The spelling of 155605266 in words is "one hundred fifty-five million, six hundred five thousand, two hundred sixty-six".