664155 has 12 divisors (see below), whose sum is σ = 1151280. Its totient is φ = 354192.

The previous prime is 664151. The next prime is 664177. The reversal of 664155 is 551466.

It is a happy number.

It is not a de Polignac number, because 664155 - 2² = 664151 is a prime.

It is a super-2 number, since 2×664155² = 882203728050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664151) 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, 7335 + ... + 7424.

It is an arithmetic number, because the mean of its divisors is an integer number (95940).

2⁶⁶⁴¹⁵⁵ is an apocalyptic number.

664155 is a deficient number, since it is larger than the sum of its proper divisors (487125).

664155 is a wasteful number, since it uses less digits than its factorization.

664155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14770 (or 14767 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 664155 is about 814.9570540832. The cubic root of 664155 is about 87.2482012639.

Subtracting from 664155 its sum of digits (27), we obtain a triangular number (664128 = T₁₁₅₂).

The spelling of 664155 in words is "six hundred sixty-four thousand, one hundred fifty-five".