665141569 has 4 divisors (see below), whose sum is σ = 700149040. Its totient is φ = 630134100.

The previous prime is 665141537. The next prime is 665141579. The reversal of 665141569 is 965141566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665141569 - 2⁵ = 665141537 is a prime.

It is a super-2 number, since 2×665141569² = 884826613623563522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665141579) 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, 17503707 + ... + 17503744.

It is an arithmetic number, because the mean of its divisors is an integer number (175037260).

Almost surely, 2^665141569 is an apocalyptic number.

It is an amenable number.

665141569 is a deficient number, since it is larger than the sum of its proper divisors (35007471).

665141569 is a wasteful number, since it uses less digits than its factorization.

665141569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35007470.

The product of its digits is 194400, while the sum is 43.

The square root of 665141569 is about 25790.3386755583. The cubic root of 665141569 is about 872.9138083553.

The spelling of 665141569 in words is "six hundred sixty-five million, one hundred forty-one thousand, five hundred sixty-nine".