1604436655 has 4 divisors (see below), whose sum is σ = 1925323992. Its totient is φ = 1283549320.

The previous prime is 1604436637. The next prime is 1604436677. The reversal of 1604436655 is 5566344061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5566344061 = 13619 ⋅408719.

It is not a de Polignac number, because 1604436655 - 2²¹ = 1602339503 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160443661 + ... + 160443670.

It is an arithmetic number, because the mean of its divisors is an integer number (481330998).

Almost surely, 2^1604436655 is an apocalyptic number.

1604436655 is a deficient number, since it is larger than the sum of its proper divisors (320887337).

1604436655 is an equidigital number, since it uses as much as digits as its factorization.

1604436655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320887336.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 1604436655 is about 40055.4197955782. The cubic root of 1604436655 is about 1170.6871690771.

The spelling of 1604436655 in words is "one billion, six hundred four million, four hundred thirty-six thousand, six hundred fifty-five".