667135471 has 4 divisors (see below), whose sum is σ = 706378752. Its totient is φ = 627892192.

The previous prime is 667135463. The next prime is 667135489. The reversal of 667135471 is 174531766.

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

It is a cyclic number.

It is not a de Polignac number, because 667135471 - 2³ = 667135463 is a prime.

It is a super-3 number, since 3×667135471³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667135421) 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, 19621615 + ... + 19621648.

It is an arithmetic number, because the mean of its divisors is an integer number (176594688).

Almost surely, 2^667135471 is an apocalyptic number.

667135471 is a deficient number, since it is larger than the sum of its proper divisors (39243281).

667135471 is a wasteful number, since it uses less digits than its factorization.

667135471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39243280.

The product of its digits is 105840, while the sum is 40.

The square root of 667135471 is about 25828.9657361653. The cubic root of 667135471 is about 873.7851859104.

The spelling of 667135471 in words is "six hundred sixty-seven million, one hundred thirty-five thousand, four hundred seventy-one".