1555166 has 4 divisors (see below), whose sum is σ = 2332752. Its totient is φ = 777582.

The previous prime is 1555163. The next prime is 1555187. The reversal of 1555166 is 6615551.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388790 + ... + 388793.

It is an arithmetic number, because the mean of its divisors is an integer number (583188).

2^1555166 is an apocalyptic number.

1555166 is a deficient number, since it is larger than the sum of its proper divisors (777586).

1555166 is an equidigital number, since it uses as much as digits as its factorization.

1555166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777585.

The product of its digits is 4500, while the sum is 29.

The square root of 1555166 is about 1247.0629494937. The cubic root of 1555166 is about 115.8578818400.

The spelling of 1555166 in words is "one million, five hundred fifty-five thousand, one hundred sixty-six".