665222871 has 8 divisors (see below), whose sum is σ = 887249664. Its totient is φ = 443339000.

The previous prime is 665222863. The next prime is 665222911. The reversal of 665222871 is 178222566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665222871 - 2³ = 665222863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665222861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24351 + ... + 43856.

It is an arithmetic number, because the mean of its divisors is an integer number (110906208).

Almost surely, 2^665222871 is an apocalyptic number.

665222871 is a deficient number, since it is larger than the sum of its proper divisors (222026793).

665222871 is a wasteful number, since it uses less digits than its factorization.

665222871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71461.

The product of its digits is 80640, while the sum is 39.

The square root of 665222871 is about 25791.9148377936. The cubic root of 665222871 is about 872.9493730884.

The spelling of 665222871 in words is "six hundred sixty-five million, two hundred twenty-two thousand, eight hundred seventy-one".