667505671 has 16 divisors (see below), whose sum is σ = 796981248. Its totient is φ = 547005600.

The previous prime is 667505669. The next prime is 667505689. The reversal of 667505671 is 176505766.

It is a cyclic number.

It is not a de Polignac number, because 667505671 - 2¹ = 667505669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667505651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520 + ... + 36541.

It is an arithmetic number, because the mean of its divisors is an integer number (49811328).

Almost surely, 2^667505671 is an apocalyptic number.

667505671 is a deficient number, since it is larger than the sum of its proper divisors (129475577).

667505671 is a wasteful number, since it uses less digits than its factorization.

667505671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37182.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 667505671 is about 25836.1311151651. The cubic root of 667505671 is about 873.9467800069.

The spelling of 667505671 in words is "six hundred sixty-seven million, five hundred five thousand, six hundred seventy-one".