666255293 has 4 divisors (see below), whose sum is σ = 726823968. Its totient is φ = 605686620.

The previous prime is 666255277. The next prime is 666255341. The reversal of 666255293 is 392552666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 666255293 - 2⁴ = 666255277 is a prime.

It is a super-2 number, since 2×666255293² = 887792230901031698, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666255203) 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, 30284321 + ... + 30284342.

It is an arithmetic number, because the mean of its divisors is an integer number (181705992).

Almost surely, 2^666255293 is an apocalyptic number.

It is an amenable number.

666255293 is a deficient number, since it is larger than the sum of its proper divisors (60568675).

666255293 is a wasteful number, since it uses less digits than its factorization.

666255293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60568674.

The product of its digits is 583200, while the sum is 44.

The square root of 666255293 is about 25811.9215286270. The cubic root of 666255293 is about 873.4007437655.

The spelling of 666255293 in words is "six hundred sixty-six million, two hundred fifty-five thousand, two hundred ninety-three".