1605670555 has 4 divisors (see below), whose sum is σ = 1926804672. Its totient is φ = 1284536440.

The previous prime is 1605670529. The next prime is 1605670589. The reversal of 1605670555 is 5550765061.

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

It is not a de Polignac number, because 1605670555 - 2⁵ = 1605670523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160567051 + ... + 160567060.

It is an arithmetic number, because the mean of its divisors is an integer number (481701168).

Almost surely, 2^1605670555 is an apocalyptic number.

1605670555 is a deficient number, since it is larger than the sum of its proper divisors (321134117).

1605670555 is an equidigital number, since it uses as much as digits as its factorization.

1605670555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321134116.

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 1605670555 is about 40070.8192454310. The cubic root of 1605670555 is about 1170.9871997761.

The spelling of 1605670555 in words is "one billion, six hundred five million, six hundred seventy thousand, five hundred fifty-five".