665734271 has 4 divisors (see below), whose sum is σ = 670816344. Its totient is φ = 660652200.

The previous prime is 665734259. The next prime is 665734283. The reversal of 665734271 is 172437566.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (665734259) and next prime (665734283).

It is a cyclic number.

It is not a de Polignac number, because 665734271 - 2¹⁰ = 665733247 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 (665734171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2540840 + ... + 2541101.

It is an arithmetic number, because the mean of its divisors is an integer number (167704086).

Almost surely, 2^665734271 is an apocalyptic number.

665734271 is a deficient number, since it is larger than the sum of its proper divisors (5082073).

665734271 is a wasteful number, since it uses less digits than its factorization.

665734271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5082072.

The product of its digits is 211680, while the sum is 41.

The square root of 665734271 is about 25801.8268926834. The cubic root of 665734271 is about 873.1730134044.

The spelling of 665734271 in words is "six hundred sixty-five million, seven hundred thirty-four thousand, two hundred seventy-one".