667432543 has 4 divisors (see below), whose sum is σ = 674040888. Its totient is φ = 660824200.

The previous prime is 667432523. The next prime is 667432567. The reversal of 667432543 is 345234766.

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 667432543 - 2¹⁷ = 667301471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667432496 and 667432505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667432523) 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, 3304021 + ... + 3304222.

It is an arithmetic number, because the mean of its divisors is an integer number (168510222).

Almost surely, 2^667432543 is an apocalyptic number.

667432543 is a deficient number, since it is larger than the sum of its proper divisors (6608345).

667432543 is a wasteful number, since it uses less digits than its factorization.

667432543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6608344.

The product of its digits is 362880, while the sum is 40.

The square root of 667432543 is about 25834.7158490276. The cubic root of 667432543 is about 873.9148640163.

The spelling of 667432543 in words is "six hundred sixty-seven million, four hundred thirty-two thousand, five hundred forty-three".