667585271 has 4 divisors (see below), whose sum is σ = 669445200. Its totient is φ = 665725344.

The previous prime is 667585241. The next prime is 667585283. The reversal of 667585271 is 172585766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 172585766 = 2 ⋅86292883.

It is a cyclic number.

It is not a de Polignac number, because 667585271 - 2⁶ = 667585207 is a prime.

It is a super-2 number, since 2×667585271² = 891340188112286882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667585211) 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, 929426 + ... + 930143.

It is an arithmetic number, because the mean of its divisors is an integer number (167361300).

Almost surely, 2^667585271 is an apocalyptic number.

667585271 is a deficient number, since it is larger than the sum of its proper divisors (1859929).

667585271 is a wasteful number, since it uses less digits than its factorization.

667585271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859928.

The product of its digits is 705600, while the sum is 47.

The square root of 667585271 is about 25837.6715475679. The cubic root of 667585271 is about 873.9815179882.

The spelling of 667585271 in words is "six hundred sixty-seven million, five hundred eighty-five thousand, two hundred seventy-one".