667435543 has 4 divisors (see below), whose sum is σ = 667959480. Its totient is φ = 666911608.

The previous prime is 667435511. The next prime is 667435567. The reversal of 667435543 is 345534766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345534766 = 2 ⋅172767383.

It is a cyclic number.

It is not a de Polignac number, because 667435543 - 2⁵ = 667435511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667435543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667435583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260053 + ... + 262606.

It is an arithmetic number, because the mean of its divisors is an integer number (166989870).

Almost surely, 2^667435543 is an apocalyptic number.

667435543 is a deficient number, since it is larger than the sum of its proper divisors (523937).

667435543 is a wasteful number, since it uses less digits than its factorization.

667435543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523936.

The product of its digits is 907200, while the sum is 43.

The square root of 667435543 is about 25834.7739103713. The cubic root of 667435543 is about 873.9161733824.

The spelling of 667435543 in words is "six hundred sixty-seven million, four hundred thirty-five thousand, five hundred forty-three".