665160061 has 4 divisors (see below), whose sum is σ = 665322012. Its totient is φ = 664998112.

The previous prime is 665160029. The next prime is 665160079. The reversal of 665160061 is 160061566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 423948100 + 241211961 = 20590^2 + 15531^2 .

It is a cyclic number.

It is not a de Polignac number, because 665160061 - 2⁵ = 665160029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665160011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74650 + ... + 83083.

It is an arithmetic number, because the mean of its divisors is an integer number (166330503).

Almost surely, 2^665160061 is an apocalyptic number.

It is an amenable number.

665160061 is a deficient number, since it is larger than the sum of its proper divisors (161951).

665160061 is a wasteful number, since it uses less digits than its factorization.

665160061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161950.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 665160061 is about 25790.6971794095. The cubic root of 665160061 is about 872.9218977473.

The spelling of 665160061 in words is "six hundred sixty-five million, one hundred sixty thousand, sixty-one".