155565660 has 24 divisors (see below), whose sum is σ = 435584016. Its totient is φ = 41484160.

The previous prime is 155565647. The next prime is 155565661. The reversal of 155565660 is 66565551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155565661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296321 + ... + 1296440.

It is an arithmetic number, because the mean of its divisors is an integer number (18149334).

Almost surely, 2^155565660 is an apocalyptic number.

155565660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155565660 is an abundant number, since it is smaller than the sum of its proper divisors (280018356).

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

155565660 is a wasteful number, since it uses less digits than its factorization.

155565660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592773 (or 2592771 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 155565660 is about 12472.5963616242. The cubic root of 155565660 is about 537.8211932799.

The spelling of 155565660 in words is "one hundred fifty-five million, five hundred sixty-five thousand, six hundred sixty".