665852271 has 32 divisors (see below), whose sum is σ = 1045933056. Its totient is φ = 368928000.

The previous prime is 665852269. The next prime is 665852279. The reversal of 665852271 is 172258566.

It is not a de Polignac number, because 665852271 - 2¹ = 665852269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665852279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87291 + ... + 94611.

It is an arithmetic number, because the mean of its divisors is an integer number (32685408).

Almost surely, 2^665852271 is an apocalyptic number.

665852271 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

665852271 is a deficient number, since it is larger than the sum of its proper divisors (380080785).

665852271 is a wasteful number, since it uses less digits than its factorization.

665852271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7463.

The product of its digits is 201600, while the sum is 42.

The square root of 665852271 is about 25804.1134511535. The cubic root of 665852271 is about 873.2245997170.

The spelling of 665852271 in words is "six hundred sixty-five million, eight hundred fifty-two thousand, two hundred seventy-one".