1604322665 has 48 divisors (see below), whose sum is σ = 2240784000. Its totient is φ = 1098789120.

The previous prime is 1604322653. The next prime is 1604322689. The reversal of 1604322665 is 5662234061.

It is a happy number.

It is not a de Polignac number, because 1604322665 - 2⁴ = 1604322649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2678036 + ... + 2678634.

It is an arithmetic number, because the mean of its divisors is an integer number (46683000).

Almost surely, 2^1604322665 is an apocalyptic number.

It is an amenable number.

1604322665 is a deficient number, since it is larger than the sum of its proper divisors (636461335).

1604322665 is a wasteful number, since it uses less digits than its factorization.

1604322665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 1604322665 is about 40053.9968667298. The cubic root of 1604322665 is about 1170.6594439167.

The spelling of 1604322665 in words is "one billion, six hundred four million, three hundred twenty-two thousand, six hundred sixty-five".