669515543 has 4 divisors (see below), whose sum is σ = 669918840. Its totient is φ = 669112248.

The previous prime is 669515507. The next prime is 669515551. The reversal of 669515543 is 345515966.

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 669515543 - 2²⁸ = 401080087 is a prime.

It is a super-3 number, since 3×669515543³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669515494 and 669515503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669515563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199148 + ... + 202481.

It is an arithmetic number, because the mean of its divisors is an integer number (167479710).

Almost surely, 2^669515543 is an apocalyptic number.

669515543 is a deficient number, since it is larger than the sum of its proper divisors (403297).

669515543 is a wasteful number, since it uses less digits than its factorization.

669515543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403296.

The product of its digits is 486000, while the sum is 44.

The square root of 669515543 is about 25874.9984154589. The cubic root of 669515543 is about 874.8230577722.

The spelling of 669515543 in words is "six hundred sixty-nine million, five hundred fifteen thousand, five hundred forty-three".