66995 has 4 divisors (see below), whose sum is σ = 80400. Its totient is φ = 53592.

The previous prime is 66977. The next prime is 67003. The reversal of 66995 is 59966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59966 = 2 ⋅29983.

It is a cyclic number.

It is not a de Polignac number, because 66995 - 2⁶ = 66931 is a prime.

It is a d-powerful number, because it can be written as 6² + 6⁵ + 9 + 9⁵ + 5³ .

It is a congruent number.

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, 6695 + ... + 6704.

It is an arithmetic number, because the mean of its divisors is an integer number (20100).

2⁶⁶⁹⁹⁵ is an apocalyptic number.

66995 is a deficient number, since it is larger than the sum of its proper divisors (13405).

66995 is a wasteful number, since it uses less digits than its factorization.

66995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13404.

The product of its digits is 14580, while the sum is 35.

The square root of 66995 is about 258.8339235881. The cubic root of 66995 is about 40.6144706440.

The spelling of 66995 in words is "sixty-six thousand, nine hundred ninety-five".