155665660 has 24 divisors (see below), whose sum is σ = 335734560. Its totient is φ = 60583104.

The previous prime is 155665639. The next prime is 155665661. The reversal of 155665660 is 66566551.

155665660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155665661) 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, 104440 + ... + 105919.

It is an arithmetic number, because the mean of its divisors is an integer number (13988940).

Almost surely, 2^155665660 is an apocalyptic number.

155665660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155665660 is an abundant number, since it is smaller than the sum of its proper divisors (180068900).

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

155665660 is a wasteful number, since it uses less digits than its factorization.

155665660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210405 (or 210403 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 155665660 is about 12476.6045060345. The cubic root of 155665660 is about 537.9364085090.

The spelling of 155665660 in words is "one hundred fifty-five million, six hundred sixty-five thousand, six hundred sixty".