1600145665 has 8 divisors (see below), whose sum is σ = 1925113320. Its totient is φ = 1276824192.

The previous prime is 1600145639. The next prime is 1600145669. The reversal of 1600145665 is 5665410061.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 265266369 + 1334879296 = 16287^2 + 36536^2 .

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 1600145665 - 2⁵ = 1600145633 is a prime.

It is a super-2 number, since 2×1600145665² = 5120932298436584450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1600145665.

It is not an unprimeable number, because it can be changed into a prime (1600145669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409404 + ... + 413293.

It is an arithmetic number, because the mean of its divisors is an integer number (240639165).

Almost surely, 2^1600145665 is an apocalyptic number.

It is an amenable number.

1600145665 is a deficient number, since it is larger than the sum of its proper divisors (324967655).

1600145665 is an equidigital number, since it uses as much as digits as its factorization.

1600145665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823091.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1600145665 is about 40001.8207710599. The cubic root of 1600145665 is about 1169.6425881284.

The spelling of 1600145665 in words is "one billion, six hundred million, one hundred forty-five thousand, six hundred sixty-five".