669014609 has 4 divisors (see below), whose sum is σ = 669076404. Its totient is φ = 668952816.

The previous prime is 669014603. The next prime is 669014653. The reversal of 669014609 is 906410966.

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 can be written as a sum of positive squares in 2 ways, for example, as 322310209 + 346704400 = 17953^2 + 18620^2 .

It is a cyclic number.

It is not a de Polignac number, because 669014609 - 2²⁴ = 652237393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669014603) 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, 9902 + ... + 37895.

It is an arithmetic number, because the mean of its divisors is an integer number (167269101).

Almost surely, 2^669014609 is an apocalyptic number.

It is an amenable number.

669014609 is a deficient number, since it is larger than the sum of its proper divisors (61795).

669014609 is a wasteful number, since it uses less digits than its factorization.

669014609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61794.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 669014609 is about 25865.3167194991. The cubic root of 669014609 is about 874.6048213880.

The spelling of 669014609 in words is "six hundred sixty-nine million, fourteen thousand, six hundred nine".