1669604409 has 12 divisors (see below), whose sum is σ = 2630891952. Its totient is φ = 1011881400.

The previous prime is 1669604401. The next prime is 1669604429. The reversal of 1669604409 is 9044069661.

It is not a de Polignac number, because 1669604409 - 2³ = 1669604401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1669604401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8432247 + ... + 8432444.

It is an arithmetic number, because the mean of its divisors is an integer number (219240996).

Almost surely, 2^1669604409 is an apocalyptic number.

It is an amenable number.

1669604409 is a deficient number, since it is larger than the sum of its proper divisors (961287543).

1669604409 is a wasteful number, since it uses less digits than its factorization.

1669604409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16864708 (or 16864705 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 1669604409 is about 40860.7930539778. The cubic root of 1669604409 is about 1186.3273083372.

The spelling of 1669604409 in words is "one billion, six hundred sixty-nine million, six hundred four thousand, four hundred nine".