155628666 has 24 divisors (see below), whose sum is σ = 342912960. Its totient is φ = 50996616.

The previous prime is 155628647. The next prime is 155628667. The reversal of 155628666 is 666826551.

It is a happy number.

155628666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155628667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72210 + ... + 74333.

It is an arithmetic number, because the mean of its divisors is an integer number (14288040).

Almost surely, 2^155628666 is an apocalyptic number.

155628666 is an abundant number, since it is smaller than the sum of its proper divisors (187284294).

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

155628666 is a wasteful number, since it uses less digits than its factorization.

155628666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146610 (or 146607 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 155628666 is about 12475.1218831721. The cubic root of 155628666 is about 537.8937915393.

The spelling of 155628666 in words is "one hundred fifty-five million, six hundred twenty-eight thousand, six hundred sixty-six".