669497443 has 4 divisors (see below), whose sum is σ = 669573648. Its totient is φ = 669421240.

The previous prime is 669497419. The next prime is 669497447. The reversal of 669497443 is 344794966.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 669497443 - 2²⁹ = 132626531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669497447) 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, 22903 + ... + 43168.

It is an arithmetic number, because the mean of its divisors is an integer number (167393412).

Almost surely, 2^669497443 is an apocalyptic number.

669497443 is a deficient number, since it is larger than the sum of its proper divisors (76205).

669497443 is a wasteful number, since it uses less digits than its factorization.

669497443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76204.

The product of its digits is 3919104, while the sum is 52.

The square root of 669497443 is about 25874.6486546194. The cubic root of 669497443 is about 874.8151742410.

The spelling of 669497443 in words is "six hundred sixty-nine million, four hundred ninety-seven thousand, four hundred forty-three".