669489543 has 28 divisors (see below), whose sum is σ = 1047443760. Its totient is φ = 426910176.

The previous prime is 669489523. The next prime is 669489551. The reversal of 669489543 is 345984966.

669489543 is a `hidden beast` number, since 6 + 6 + 94 + 8 + 9 + 543 = 666.

It is not a de Polignac number, because 669489543 - 2⁹ = 669489031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669489543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669489523) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3198 + ... + 36731.

Almost surely, 2^669489543 is an apocalyptic number.

669489543 is a deficient number, since it is larger than the sum of its proper divisors (377954217).

669489543 is an equidigital number, since it uses as much as digits as its factorization.

669489543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39970 (or 39955 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 669489543 is about 25874.4959950914. The cubic root of 669489543 is about 874.8117333182.

The spelling of 669489543 in words is "six hundred sixty-nine million, four hundred eighty-nine thousand, five hundred forty-three".