667523671 has 4 divisors (see below), whose sum is σ = 678466744. Its totient is φ = 656580600.

The previous prime is 667523663. The next prime is 667523743. The reversal of 667523671 is 176325766.

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 667523671 - 2³ = 667523663 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 (667523471) 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, 5471445 + ... + 5471566.

It is an arithmetic number, because the mean of its divisors is an integer number (169616686).

Almost surely, 2^667523671 is an apocalyptic number.

667523671 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

667523671 is a deficient number, since it is larger than the sum of its proper divisors (10943073).

667523671 is a wasteful number, since it uses less digits than its factorization.

667523671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10943072.

The product of its digits is 317520, while the sum is 43.

The square root of 667523671 is about 25836.4794621868. The cubic root of 667523671 is about 873.9546355710.

The spelling of 667523671 in words is "six hundred sixty-seven million, five hundred twenty-three thousand, six hundred seventy-one".