669995 has 4 divisors (see below), whose sum is σ = 804000. Its totient is φ = 535992.

The previous prime is 669989. The next prime is 670001. The reversal of 669995 is 599966.

669995 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 599966 = 2 ⋅299983.

It is an interprime number because it is at equal distance from previous prime (669989) and next prime (670001).

It is a cyclic number.

It is not a de Polignac number, because 669995 - 2⁶ = 669931 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669995.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66995 + ... + 67004.

It is an arithmetic number, because the mean of its divisors is an integer number (201000).

2⁶⁶⁹⁹⁹⁵ is an apocalyptic number.

669995 is a deficient number, since it is larger than the sum of its proper divisors (134005).

669995 is a wasteful number, since it uses less digits than its factorization.

669995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134004.

The product of its digits is 131220, while the sum is 44.

The square root of 669995 is about 818.5322229454. The cubic root of 669995 is about 87.5031835576.

The spelling of 669995 in words is "six hundred sixty-nine thousand, nine hundred ninety-five".