666797 has 4 divisors (see below), whose sum is σ = 689820. Its totient is φ = 643776.

The previous prime is 666773. The next prime is 666811. The reversal of 666797 is 797666.

666797 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: 797666 = 2 ⋅398833.

It can be written as a sum of positive squares in 2 ways, for example, as 454276 + 212521 = 674^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 666797 - 2⁶ = 666733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11468 + ... + 11525.

It is an arithmetic number, because the mean of its divisors is an integer number (172455).

2⁶⁶⁶⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

666797 is a deficient number, since it is larger than the sum of its proper divisors (23023).

666797 is a wasteful number, since it uses less digits than its factorization.

666797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23022.

The product of its digits is 95256, while the sum is 41.

The square root of 666797 is about 816.5763895681. The cubic root of 666797 is about 87.3637389354.

The spelling of 666797 in words is "six hundred sixty-six thousand, seven hundred ninety-seven".