1613165665 has 8 divisors (see below), whose sum is σ = 1953559080. Its totient is φ = 1278692352.

The previous prime is 1613165621. The next prime is 1613165677. The reversal of 1613165665 is 5665613161.

It can be written as a sum of positive squares in 4 ways, for example, as 586027264 + 1027138401 = 24208^2 + 32049^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1613165665 - 2⁹ = 1613165153 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1479424 + ... + 1480513.

It is an arithmetic number, because the mean of its divisors is an integer number (244194885).

Almost surely, 2^1613165665 is an apocalyptic number.

It is an amenable number.

1613165665 is a deficient number, since it is larger than the sum of its proper divisors (340393415).

1613165665 is a wasteful number, since it uses less digits than its factorization.

1613165665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2960051.

The product of its digits is 97200, while the sum is 40.

The square root of 1613165665 is about 40164.2336538368. The cubic root of 1613165665 is about 1172.8063892582.

It can be divided in two parts, 16131 and 65665, that added together give a square (81796 = 286²).

The spelling of 1613165665 in words is "one billion, six hundred thirteen million, one hundred sixty-five thousand, six hundred sixty-five".