1605423204009 has 16 divisors (see below), whose sum is σ = 2378553364800. Its totient is φ = 1070215257888.

The previous prime is 1605423204001. The next prime is 1605423204023. The reversal of 1605423204009 is 9004023245061.

It is a happy number.

1605423204009 is a `hidden beast` number, since 1 + 605 + 4 + 2 + 3 + 2 + 0 + 40 + 0 + 9 = 666.

It is not a de Polignac number, because 1605423204009 - 2³ = 1605423204001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1605423204001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1415719 + ... + 2283660.

It is an arithmetic number, because the mean of its divisors is an integer number (148659585300).

Almost surely, 2^{1605423204009} is an apocalyptic number.

It is an amenable number.

1605423204009 is a deficient number, since it is larger than the sum of its proper divisors (773130160791).

1605423204009 is a wasteful number, since it uses less digits than its factorization.

1605423204009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3715461 (or 3715455 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 1605423204009 in words is "one trillion, six hundred five billion, four hundred twenty-three million, two hundred four thousand, nine".