667436671 has 4 divisors (see below), whose sum is σ = 728112744. Its totient is φ = 606760600.

The previous prime is 667436639. The next prime is 667436683. The reversal of 667436671 is 176634766.

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 667436671 - 2⁵ = 667436639 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 (667436611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30338020 + ... + 30338041.

It is an arithmetic number, because the mean of its divisors is an integer number (182028186).

Almost surely, 2^667436671 is an apocalyptic number.

667436671 is a deficient number, since it is larger than the sum of its proper divisors (60676073).

667436671 is a wasteful number, since it uses less digits than its factorization.

667436671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60676072.

The product of its digits is 762048, while the sum is 46.

The square root of 667436671 is about 25834.7957414027. The cubic root of 667436671 is about 873.9166657031.

The spelling of 667436671 in words is "six hundred sixty-seven million, four hundred thirty-six thousand, six hundred seventy-one".