666155 has 12 divisors (see below), whose sum is σ = 930240. Its totient is φ = 456624.

The previous prime is 666143. The next prime is 666167. The reversal of 666155 is 551666.

It is an interprime number because it is at equal distance from previous prime (666143) and next prime (666167).

It is not a de Polignac number, because 666155 - 2⁴ = 666139 is a prime.

It is an Ulam number.

It is a nialpdrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1115 + ... + 1604.

It is an arithmetic number, because the mean of its divisors is an integer number (77520).

2⁶⁶⁶¹⁵⁵ is an apocalyptic number.

666155 is a deficient number, since it is larger than the sum of its proper divisors (264085).

666155 is a wasteful number, since it uses less digits than its factorization.

666155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738 (or 2731 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 666155 is about 816.1831902214. The cubic root of 666155 is about 87.3356916533.

The spelling of 666155 in words is "six hundred sixty-six thousand, one hundred fifty-five".