665159041 has 4 divisors (see below), whose sum is σ = 665212500. Its totient is φ = 665105584.

The previous prime is 665159009. The next prime is 665159069. The reversal of 665159041 is 140951566.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 498852225 + 166306816 = 22335^2 + 12896^2 .

It is a cyclic number.

It is not a de Polignac number, because 665159041 - 2⁵ = 665159009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665159141) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2835 + ... + 36583.

It is an arithmetic number, because the mean of its divisors is an integer number (166303125).

Almost surely, 2^665159041 is an apocalyptic number.

It is an amenable number.

665159041 is a deficient number, since it is larger than the sum of its proper divisors (53459).

665159041 is a wasteful number, since it uses less digits than its factorization.

665159041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53458.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 665159041 is about 25790.6774048298. The cubic root of 665159041 is about 872.9214515485.

The spelling of 665159041 in words is "six hundred sixty-five million, one hundred fifty-nine thousand, forty-one".