667665543 has 8 divisors (see below), whose sum is σ = 897230848. Its totient is φ = 441605304.

The previous prime is 667665541. The next prime is 667665553. The reversal of 667665543 is 345566766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667665543 - 2¹ = 667665541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667665492 and 667665501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667665541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 875821 + ... + 876582.

It is an arithmetic number, because the mean of its divisors is an integer number (112153856).

Almost surely, 2^667665543 is an apocalyptic number.

667665543 is a deficient number, since it is larger than the sum of its proper divisors (229565305).

667665543 is a wasteful number, since it uses less digits than its factorization.

667665543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752533.

The product of its digits is 2721600, while the sum is 48.

The square root of 667665543 is about 25839.2248916255. The cubic root of 667665543 is about 874.0165464387.

The spelling of 667665543 in words is "six hundred sixty-seven million, six hundred sixty-five thousand, five hundred forty-three".