665161607 has 8 divisors (see below), whose sum is σ = 739322640. Its totient is φ = 593282560.

The previous prime is 665161597. The next prime is 665161631. The reversal of 665161607 is 706161566.

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 665161607 - 2¹⁴ = 665145223 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 (665161657) 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 7 ways as a sum of consecutive naturals, for example, 569882 + ... + 571047.

It is an arithmetic number, because the mean of its divisors is an integer number (92415330).

Almost surely, 2^665161607 is an apocalyptic number.

665161607 is a deficient number, since it is larger than the sum of its proper divisors (74161033).

665161607 is a wasteful number, since it uses less digits than its factorization.

665161607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140993.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 665161607 is about 25790.7271514395. The cubic root of 665161607 is about 872.9225740437.

The spelling of 665161607 in words is "six hundred sixty-five million, one hundred sixty-one thousand, six hundred seven".