669755 has 16 divisors (see below), whose sum is σ = 864000. Its totient is φ = 497280.

The previous prime is 669733. The next prime is 669763. The reversal of 669755 is 557966.

669755 = T₁₀ + T₁₁ + ... + T₁₅₈.

669755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669755 - 2¹² = 665659 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669755.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4421 + ... + 4569.

It is an arithmetic number, because the mean of its divisors is an integer number (54000).

2⁶⁶⁹⁷⁵⁵ is an apocalyptic number.

669755 is a deficient number, since it is larger than the sum of its proper divisors (194245).

669755 is a wasteful number, since it uses less digits than its factorization.

669755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214.

The product of its digits is 56700, while the sum is 38.

The square root of 669755 is about 818.3856059340. The cubic root of 669755 is about 87.4927340905.

The spelling of 669755 in words is "six hundred sixty-nine thousand, seven hundred fifty-five".