1604166365 has 4 divisors (see below), whose sum is σ = 1924999644. Its totient is φ = 1283333088.

The previous prime is 1604166307. The next prime is 1604166367. The reversal of 1604166365 is 5636614061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 785176441 + 818989924 = 28021^2 + 28618^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604166365 - 2¹⁶ = 1604100829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604166367) 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, 160416632 + ... + 160416641.

It is an arithmetic number, because the mean of its divisors is an integer number (481249911).

Almost surely, 2^1604166365 is an apocalyptic number.

It is an amenable number.

1604166365 is a deficient number, since it is larger than the sum of its proper divisors (320833279).

1604166365 is an equidigital number, since it uses as much as digits as its factorization.

1604166365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320833278.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1604166365 is about 40052.0457030599. The cubic root of 1604166365 is about 1170.6214257928.

The spelling of 1604166365 in words is "one billion, six hundred four million, one hundred sixty-six thousand, three hundred sixty-five".