665293 has 2 divisors, whose sum is σ = 665294. Its totient is φ = 665292.

The previous prime is 665279. The next prime is 665299. The reversal of 665293 is 392566.

665293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515524 + 149769 = 718^2 + 387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665293 is a prime.

It is a super-2 number, since 2×665293² = 885229551698, which contains 22 as substring.

665293 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332646 + 332647.

It is an arithmetic number, because the mean of its divisors is an integer number (332647).

2⁶⁶⁵²⁹³ is an apocalyptic number.

It is an amenable number.

665293 is a deficient number, since it is larger than the sum of its proper divisors (1).

665293 is an equidigital number, since it uses as much as digits as its factorization.

665293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 665293 is about 815.6549515573. The cubic root of 665293 is about 87.2980047979.

The spelling of 665293 in words is "six hundred sixty-five thousand, two hundred ninety-three".